U.S. patent application number 09/111614 was filed with the patent office on 2001-08-09 for arrangement for independently requesting a playing authorization for a reproduced encrypted information signal.
This patent application is currently assigned to PHILIPS CORPORATION. Invention is credited to PROIDL, ADOLF.
Application Number | 20010013022 09/111614 |
Document ID | / |
Family ID | 8231108 |
Filed Date | 2001-08-09 |
United States Patent
Application |
20010013022 |
Kind Code |
A1 |
PROIDL, ADOLF |
August 9, 2001 |
ARRANGEMENT FOR INDEPENDENTLY REQUESTING A PLAYING AUTHORIZATION
FOR A REPRODUCED ENCRYPTED INFORMATION SIGNAL
Abstract
An arrangement (1) for verifying a playing authorization for an
encrypted information signal (I) reproduced by means of a
reproducing device (2, 3) and for supplying a decrypted information
signal (I) when a playing authorization is available, comprises
verification means (19) for verifying a playing authorization for a
reproduced encrypted information signal (I), and comprises
decryption means (32) fro decrypting a reproduced encrypted
information signal (I) when a playing authorization is available,
and comprises interrogation means (43, 35) for independently
requesting a playing authorization, which interrogation means
include communication means (43) which, in the absence of a playing
authorization for a reproduced encrypted information signal (I) are
capable of setting up a data link (49, 52, 56, 59) and of supplying
playing authorization request information to a playing
authorization allocation device (51, 53, 57, 60) via the data link
(49, 52, 56, 59) and of receiving a playing authorization for the
reproduced encrypted information signal (I) from the playing
authorization allocation device (51, 53, 57, 60).
Inventors: |
PROIDL, ADOLF; (VIENNA,
AT) |
Correspondence
Address: |
CORPORATE PATENT COUNSEL
U S PHILIPS CORPORATION
580 WHITE PLAINS ROAD
TARRYTOWN
NY
10591
|
Assignee: |
PHILIPS CORPORATION
|
Family ID: |
8231108 |
Appl. No.: |
09/111614 |
Filed: |
July 7, 1998 |
Current U.S.
Class: |
705/52 ;
348/E7.056; 348/E7.061; 380/201; 713/170 |
Current CPC
Class: |
H04N 21/2541 20130101;
H04N 21/472 20130101; H04N 21/4325 20130101; H04N 21/63345
20130101; H04N 7/163 20130101; H04N 21/8355 20130101; H04N 7/1675
20130101; H04N 21/2543 20130101; H04N 21/4334 20130101 |
Class at
Publication: |
705/52 ; 380/201;
713/170 |
International
Class: |
G06F 012/14; H04L
009/00 |
Foreign Application Data
Date |
Code |
Application Number |
Jul 11, 1997 |
EP |
97890135.3 |
Claims
1. An arrangement (1) for verifying a playing authorization for a
reproduced encrypted information signal--which is reproduced by
means of a reproducing device (2, 3) adapted to cooperate with the
arrangement (1)--and for supplying a decrypted information signal
when a playing authorization is available, comprising verification
means (19) arranged to receive a reproduced encrypted information
signal and adapted to supply key information (S) suitable for
correctly decrypting the reproduced encrypted information signal
when a playing authorization is available, and decryption means
(32) arranged to receive key information (S) and adapted to decrypt
the reproduced encrypted information signal when suitable key
information (S) is available, characterized in that the arrangement
(1) is equipped with interrogation means (35, 43) for independently
requesting a playing authorization.
2. An arrangement (1) as claimed in claim 1, characterized in that
the interrogation means (35, 43) include communication means (43)
which are adapted to set up a data link (49, 52, 56, 59) between
the communication means (43) and at least one playing authorization
allocation device (51, 53, 57, 60) in the absence of a playing
authorization for a reproduced encrypted information signal, and
the communication means (43) are adapted to supply playing
authorization request information to the playing authorization
allocation device (51, 53, 57, 60) via the data link (49, 52, 56,
59) and to receive a playing authorization for the reproduced
encrypted information signal from the playing authorization
allocation device (51, 53, 57, 60).
3. An arrangement (1) as claimed in claim 2, characterized in that
the verification means (19) are adapted to read out and supply
enable information which is contained in a reproduced encrypted
information signal and which identifies a playing authorization
allocation device allowed to allocate a playing authorization for
the reproduced encrypted information signal, and the communication
means (43) are adapted to supply playing authorization request
information to the playing authorization allocation device (51, 53,
57, 60) identified by the enable information.
4. An arrangement (1) as claimed in claim 3, characterized in that
receiving means (63) have been provided for receiving an encrypted
information signal supplied by a broadcasting station (53, 57, 60,
65), the encrypted information signal containing enable information
which identifies a playing authorization allocation device (51, 53,
57, 60) allowed to allocate a playing authorization for the
encrypted information signal, and interface means (13) have been
provided for supplying an encrypted information signal containing
the enable information to a recording and reproducing device (2)
adapted to cooperate with the interface means (13) in order to
record the encrypted information signal.
5. An arrangement (1) as claimed in claim 3, characterized in that
the communication means (43) comprise memory means (45) in which
connection set-up information from playing authorization allocation
device (51, 53, 57, 60) identified by enable information can be
stored, and the communication means (43), in the absence of a
playing authorization for a reproduced encrypted information signal
containing given enable information, are adapted to set up a data
link (49, 52, 56, 59) by means of the connection set-up information
stored in the memory means (45) for supplying playing authorization
request information to the playing authorization allocation device
(51, 53, 57, 60) identified by the given enable information, and to
receive a playing authorization for the reproduced encrypted
information signal via the data link (49, 52, 56, 59).
6. An arrangement (1) as claimed in claim 2, characterized in that
the communication means (43) are adapted to supply playing
authorization request information identifying the reproduced
encrypted information signal to a playing authorization allocation
device (51, 53, 57, 60) and to receive key information (S1) from
the playing authorization allocation device (51, 53, 57, 60), which
key information is dependent on the playing authorization request
information.
7. An arrangement (1) as claimed in claim 2, characterized in that
processing means (35) have been provided for decoding a reproduced
non-encrypted information signal, which means also form part of the
interrogation means (35, 43), and the processing means (35) are
adapted to supply control information (SI) to the communication
means (43), which control information is characteristic of an
incorrect decryption of a reproduced encrypted information signal
owing to the absence of a playing authorization.
8. An arrangement (1) as claimed in claim 2, characterized in that
the verification means (19) include a key stage (22) which is
arranged to receive first key information (S1) received in the
communication means (43) from a playing authorization allocation
device (51, 53, 57, 60) and to receive second key information (S2)
contained in the reproduced encrypted information signal, and the
key stage (22), when a playing authorization is available, is
adapted to jointly process the first key information (S1) and the
second key information (S2) and to supply composite key information
(S) to the decryption means (32), which composite key information
is suitable for the correct decryption of the reproduced encrypted
information signal.
9. An arrangement (1) as claimed in claim 1, characterized in that
control means (62) have been provided which are adapted to supply,
in the absence of a playing authorization, pause information to the
reproducing device (2, 3) via interface means (13) in order to
interrupt the reproduction of an encrypted information signal, and
the control means (62) are adapted to supply, when subsequently a
playing authorization for the encrypted information signal is
available, end-of-pause information to the reproducing device (2,
3) via the interface means (13) in order to continue reproduction
of the encrypted information signal. (FIG. 1).
Description
[0001] The invention relates to an arrangement for verifying a
playing authorization for a reproduced encrypted information
signal--which is reproduced by means of a reproducing device
adapted to cooperate with the arrangement--and for supplying a
decrypted information signal when a playing authorization is
available, comprising verification means arranged to receive a
reproduced encrypted information signal and adapted to supply key
information suitable for correctly decrypting the reproduced
encrypted information signal when a playing authorization is
available, and decryption means arranged to receive key information
and adapted to decrypt the reproduced encrypted information signal
when suitable key information is available.
[0002] Such an arrangement of the type defined in the opening
paragraph is known, for example from the document WO 96/05700 A1.
In the known arrangement, which is formed by a so-called set-top
box, the verification means enable identification information
contained in a reproduced encrypted information signal to be
determined. When such identification information is present a
playing authorization for the reproduced encrypted information
signal is obtained. The identification information contains the key
information which can be supplied to the decrypting means in order
to decrypt the reproduced encrypted information signal. A
reproduced decrypted information signal can be displayed by means
of a television set which can be connected to the known
arrangement.
[0003] The known arrangement is adapted to record characteristic
playing information which characterizes the number and length of
playing events of a deccrypted information signal in the case of a
playing authorization. Furthermore, by means of a data link the
known arrangement is connected to a broadcasting station which
forms a play interrogation device. By interrogating the
characteristic playing information recorded by means of the known
arrangement the play interrogation device can determine how many
times and for how long an encrypted paid-service information signal
reproduced by the playing device has been encrypted in the known
arrangement and has consequently been used by the user of the known
arrangement. Charging for the usually repeated reproduction of
paid-service information signals can be effected on the basis of
the characteristic playing information.
[0004] However, with regard the known arrangement it has appeared
that the presence of encrypted identification information in the
reproduced encrypted information signal, which information allows a
correct decrypting of an encrypted information signal and is
necessary for the correct operation of the known arrangement, was
used by unauthorized persons for making illegal copies which
contain the information signal that has already been decrypted.
Record carriers with decrypted information signals were sold by
persons not authorized to do so, resulting in substantial financial
damage for broadcasting stations.
[0005] Moreover, when the characteristic playing information
recorded with the known arrangement is interrogated by means of a
play interrogation device the problem arises that a play
interrogation device initially has no information whether and where
there is a known arrangement by means of which paid-service
information signals for which the collection of charges is effected
by means of the play interrogation device are reproduced. This
considerably complicates the collection of charges for the
reproduction of paid-service information signals.
[0006] Furthermore, it is not possible to rule out that the
characteristic playing information recorded by the known
arrangement is changed by a person not authorized to do so, which
additionally complicates the collection of charges.
[0007] Moreover, with regard to the known arrangement it has been
found that, on the one hand, interrogating the characteristic
playing information recorded by means of the known arrangement at
comparatively long time intervals will result in uncertainty for
the user of the known arrangement as to the amount of the charges
and, on the other hand, interrogating the characteristic playing
information recorded by means of the known arrangement at
comparatively short time intervals will result in a comparatively
large expense for the broadcasting station.
[0008] It is an object of the invention to preclude the problems
mentioned above and to provide an improved arrangement of the type
defined in the opening paragraph, by means of which, on the one
hand, manipulation in determining the charges for the reproduction
of paid-service information signals is substantially precluded but,
on the other hand, a high flexibility and a low cost in determining
the charges can be obtained for a broadcasting station. According
to the invention, this object is achieved in an arrangement of the
type defined in the opening paragraph in that the arrangement is
equipped with interrogation means for independently requesting a
playing authorization. Thus, it is achieved in a simple manner that
by means of the arrangement in accordance with the invention an
independent request for a playing authorization is possible, when
required. Upon reception of key information on which a playing
authorization is based a reproduced encrypted information signal
can be decrypted by means of the arrangement in accordance with the
invention. Manipulation by an unauthorized person is then ruled out
almost completely because characteristic billing information is
generated exclusively in the playing authorization allocation
device upon reception of playing authorization request information.
Furthermore, charging of the fees to the user of the arrangement in
accordance with the invention can be effected at comparatively
short time intervals and with a particularly low expenditure for
the playing authorization allocation device.
[0009] In an arrangement in accordance with the invention having
the characteristic features defined in claim 1 it has proved to be
advantageous if, in addition, the measures defined in claim 2 are
taken. In practice, it has proved that such an embodiment is
particularly reliable and simple and can be realized at
comparatively low cost.
[0010] In an arrangement in accordance with the invention having
the characteristic features defined in claim 2 it has proved to be
advantageous if, in addition, the measures defined in claim 3 are
taken. In this way, it is achieved that playing authorization
request information for a given paid-service information signal can
be supplied to the playing authorization allocation device, which
is capable of allocating a playing authorization for this given
paid-service information signal. Moreover, the key information,
which is necessary for decrypting the reproduced encrypted
information signal and which is transmitted to the arrangement upon
reception of the playing authorization, is stored only in the
playing authorization allocation device identified by the enable
information.
[0011] In an arrangement in accordance with the invention having
the characteristic features defined in claim 3 it has proved to be
advantageous if, in addition, the measures defined in claim 4 are
taken. This has the advantage that encrypted information signals
transmitted by a broadcasting station and received by the
arrangement in accordance with the invention, which signals contain
enable information identifying a playing authorization allocation
device enabled to allocate a playing authorization, can be supplied
to a recording and reproducing device for recording the encrypted
information signal. As a result of this, determining the charges
for the reproduction of paid-service information signals from a
plurality of broadcasting stations can be effected by means of only
one playing authorization allocation device.
[0012] In an arrangement in accordance with the invention having
the characteristic features defined in claim 3 it has further
proved to be advantageous if, in addition, the measures defined in
claim 5 are taken. This has the advantage that the connection
set-up information of a plurality of playing authorization
allocation devices can be stored and that playing authorization
request information can be supplied to a playing authorization
allocation device via the data link in a particularly simple manner
and with only a very small time delay.
[0013] In an arrangement in accordance with the invention having
the characteristic features defined in claim 2 it has proved to be
advantageous if, in addition, the measures defined in claim 6 are
taken. This has the advantage that on the basis of the playing
authorization request information a playing authorization
allocation device can detect which paid-service information signal
the user of the arrangement wishes to play. As a result of this,
determining the charges is possible is in a particularly flexible
manner. It is to be noted that the measures defined in claim 6 can
also be applied advantageously in arrangements in accordance with
the invention having the characteristic features defined in claims
3, 4 and 5.
[0014] In an arrangement in accordance with the invention having
the characteristic features defined in claim 2 it has proved to be
advantageous if, in addition, the measures defined in claim 7 are
taken. This has the advantage that the presence or absence of a
playing authorization for a reproduced paid-service information
signal can be detected in a particularly simple manner. It is to be
noted that the measures defined in claim 7 can also be applied
advantageously in arrangements in accordance with the invention
having the characteristic features defined in claims 3, 4, 5 and
6.
[0015] In an arrangement in accordance with the invention having
the characteristic features defined in claim 2 it has proved to be
advantageous if, in addition, the measures defined in claim 8 are
taken. As a result of the provision of key information composed of
first key information and second key information a particularly
high degree of protection against manipulation by unauthorized
persons can be achieved with the arrangement in accordance with the
invention. Such encrypting systems are used, for example, during
transmission in accordance with the Digital Video Broadcasting
Standard. It is to be noted that the measures defined in claim 8
can also be applied to the arrangements in accordance with the
invention having the characteristic features defined in claims 3,
4, 5, 6 and 7.
[0016] In an arrangement in accordance with the invention having
the characteristic features defined in claim 1 it has proved to be
advantageous if, in addition, the measures defined in claim 9 are
taken. This has the advantage that the reproduction of a
paid-service information signal is interrupted until a playing
authorization from a playing authorization allocation device
appears and the user of the arrangement consequently does not skip
a part of the paid-service information signal during the
reproduction of this signal. It is to be noted that the measures
defined in claim 8 can also be applied to the arrangements in
accordance with the invention having the characteristic features
defined in claims 2, 3, 4, 5, 6, 7 and 8.
[0017] The afore-mentioned aspects as well as further aspects of
the invention will be apparent from the embodiment described
hereinafter by way of example and will be elucidated on the basis
of this embodiment.
[0018] The invention will now be described in more detail with
reference to the embodiment shown in the drawing and given by way
of example, but to which the invention is not limited.
[0019] FIG. 1 shows a diagrammatic representation in the form of a
block diagram of an arrangement in accordance with the invention to
which an encrypted paid-service information signal can be applied
and which is constructed for independently requesting a playing
authorization for the information signal in the absence of such a
playing authorization.
[0020] FIG. 1 shows an arrangement 1 formed by a so-called set-top
box constructed to verify a playing authorization for a
paid-service information signal I reproduced by means of a
reproducing device, which information signal is available at a
charge and is therefore encrypted. An information signal I can be
reproduced, for example, by a DVHS video recorder 2, which forms a
recording and reproducing device, or by a DVD apparatus 3, which
forms a reproducing device. When a playing authorization exists the
arrangement 1 is adapted to supply a decrypted information signal I
to a TV set 4. A playing authorization can be given by the fact
that an information signal reproduced by the reproducing device is
not encrypted. A playing authorization for a reproduced encrypted
paid-service information signal I is given by the presence of key
information S suitable for successfully decrypting the encrypted
information signal I. Suitable key information S can be stored in
the arrangement 1 or can be received by playing authorization
allocation means 5, which include one or more playing authorization
allocation devices, which will be described in greater detail
hereinafter.
[0021] The DVHS video recorder 2 comprises entry means 6, which
include a play button 7 and a record button 8. By actuating the
play button 7 the DVHS video recorder 2 can be set to a play mode
in which, in a generally known manner, the DVHS video recorder 2 is
adapted to reproduce digital information signals I recorded on a
magnetic tape 9 in accordance with the DVHS standard. Reproduced
information signals I can be applied to first interface means 11
via an operating connection 10. The first interface means 11 are
then adapted to transmit information signals I and control signals
ST via a generally known data bus in accordance with the bus
standard IEEE 1394. Information signals I reproduced in the play
mode can be supplied from the first interface means 11 to second
interface means 13 of the arrangement 1 via a bus connection
12.
[0022] The DVD apparatus 3 comprises entry means 14 which include a
play button 15. By actuating the play button 15 the DVD apparatus 3
can be set to a play mode in which, in a generally known manner,
the DVD apparatus 3 is adapted to reproduce digital information
signals I recorded on a a Digital Versatile Disc (DVD) in
accordance with the DVD standard. In the play made reproduced
information signals I can be applied to the second interface means
13 of the arrangement 1 via an operating connection 17, third
interface means 18 of the DVD apparatus 3 and the bus connection
12.
[0023] The arrangement 1 comprises verification means 19 having an
information signal input 20 arranged to receive a reproduced
encrypted information signal I from the second interface means 13.
The verification means 19 comprise a processing stage 21, known as
a PID selector, and a key stage 22.
[0024] A reproduced encrypted information signal I can be applied
from the information signal input 20 to the processing stage 21. A
reproduced encrypted information signal I in accordance with the
ISO/IEC 13818-1 standard is formed by successive information signal
blocks of 188 bytes each. These information signal blocks can
accommodate a plurality of video channels and audio channels as
well as additional information for a video channel or an audio
channel. A reproduced encrypted information signal I contains
enable information E, which forms additional information. Enable
information E identifies an playing authorization allocation device
of the playing authorization allocation means 5, which is enabled
or authorized to allocate a playing authorization for the
paid-service information signal I which contains the enable
information E.
[0025] The processing stage 21 has a control input 23 via which
channel-control information K from input means 26 can be applied to
the processing stage 21, which input means include an up button 24
and a down button 25. By actuating the up button 24 or the down
button 25 a video channel and its associated audio channel
contained in the reproduced encrypted information signal I can be
selected. The selected video channel, the associated audio channel
as well as additional information associated with these two
channels can be applied in the form of information signal blocks
from the processing stage 21 to an information signal output 27 of
the processing stage 21. Enable information E associated with the
selected video channel and the accompanying audio channel can be
applied to an enable output 28 of the processing stage 21.
[0026] When a reproduced information signal I is a paid-service
information signal I and is therefore encrypted, the reproduced
information signal I is encrypted by scrambling--i.e. by
time-shifting of the information signal blocks. A reproduced
encrypted information signal includes a further additional
information second key information S2, also known as ECM
information in the DVB standard. Second key information S2 contains
information about how to restore the scrambled--i.e.
time-shifted--information signal blocks to the correct sequence and
thus on how to decrypt them. However, such second key information
S2 is also encrypted and can only form composite key information S
suitable for decrypting a reproduced encrypted I in conjunction
with first key information S1, which is known as EMM information in
the DVB standard and which serves for decrypting the second key
information S2. In order to achieve an effective protection against
an unauthorized reproduction of a paid-service information signal I
by non-authorized persons, the second key information S2 is changed
at short periodic time intervals. The first key information S1 is
usually changed at long periodic intervals and is transmitted as
additional information in an information signal I.
[0027] A membership card 29 can be inserted into the key stage 22,
which card is formed by a so-called smart card and in which first
key information S1 can be stored upon payment of a membership fee.
When, upon payment of a fee by the owner of the membership card 29,
the membership card 29 allows the owner of the membership card 29
to decrypt and thus use the paid-service information signal I
during the next weeks new first key information S1 is stored in the
membership card 29.
[0028] From the processing stage 21 second key information S2 can
be applied to the key stage 22. In conjunction with the membership
card 29 the key stage 22 is capable of decrypting the second key
information S2 by means of first key information S1 stored in the
membership card 29 and last applied to a first key input 30 or to a
second input 31. In the case of playing authorization the
membership card 29 stores suitable first key information S1 for the
second key information S2 contained in the reproduced encrypted
information signal I, as a result of which the key stage 22 is
capable of jointly processing the first key information S1 and the
second key information S2 and supplying composite key information
suitable for correctly decrypting the reproduced encrypted
information signal I. As a result, reproduced encrypted information
signals I can be applied to the information signal input 20 of the
verification means 19 and in the case of a playing authorization
the verification means 19 can supply composite key information S
for the correct decryption of the reproduced encrypted information
signal I. Owing to the provision of composite key information
S--formed by the first key information S1, stored in the membership
card 29, and by the second key information S2, contained in the
reproduced encrypted information signal I--a particularly high
protection against manipulation by an unauthorized person is
achieved with the arrangement in accordance with the invention.
[0029] The composite key information S can be applied to decrypting
means 32, which in the present case are formed by a so-called
descrambler. Furthermore, a reproduced encrypted information signal
I, which appears on the output 27 of the processing stage 21, can
be applied to the decrypting means 32. Decryption of the
information signal I, which has been encrypted by scrambling of
information signal blocks, is effected by restoring the correct
time sequence--i.e. by descrambling--of the information signal
blocks of the encrypted information signal I.
[0030] If the reproduced information signal I is a toll-free and,
consequently, non-encrypted information signal I the information
signal I applied to the decryption means 32 can be transferred
directly to an output 33 of the decryption means 32. However, if a
reproduced information signal I available on the information signal
output 27 of the processing stage 21 is a paid-service information
signal I, which is consequently encrypted, the decryption means 32
effect a decryption of the encrypted information signal I. It is to
be noted that the decryption means 32--which only receives
composite key information S suitable for the correct decryption of
the encrypted information signal I in the case of a playing
authorization--only produce a decrypted information signal I on the
output 33 in the case that a playing authorization is available.
However, if no playing authorization is available and the
decryption means 32 do not receive composite key information S
suitable or the correct decryption of the encrypted information
signal I, no decrypted information signal I but merely an
incorrectly decrypted and therefore, in fact, still encrypted
information signal I is available on the output 33 of the
decryption means 32.
[0031] An information signal I available on the output 33 of the
decryption means 32 can be applied to a demultiplexer stage 34
provided in the processing means 35, which in the present case also
form part of the interrogation means for independently requesting a
playing authorization. The demultiplexer stage 34 is adapted to
supply the video information signal blocks corresponding to the
selected video channel and contained in the information signal I to
first decoder means 36 and to supply audio information signal
blocks corresponding to the selected audio channel and contained in
the information signal I to second decoder means 37.
[0032] The first decoder means 36 are formed by an MPEG decoder and
are adapted to decode the video information signal blocks encoded
in accordance with an MPEG standard. A decoded digital video
information signal can be applied from the first decoder means 36
to a digital-to-analog converter 38, which can supply an analog
video information signal to a video output 39 of the arrangement 1.
The first decoder means 36 have a control information output 40 on
which control information SI is available if the first decoder
means 36 do not succeed in decoding the video information signal
blocks. This is the case if owing to the absence of a playing
authorization not a decrypted but an incorrectly decrypted and,
consequently, encrypted information signal appears and, as a result
of this, incorrectly decrypted, i.e. in fact encrypted, video
information signal blocks are applied to the first decoder means
36.
[0033] The second decoder means 37 include an MPEG decoder and an
AC-3 decoder and are adapted to decode the audio information signal
blocks which have been encoded in accordance with an MPEG standard
or the AC-3 standard. A decoded digital audio information signal
can be supplied from the second decoder means 37 to a
digital-to-analog converter stage 41, which can supply an analog
audio information signal to an audio output 42 of the arrangement
1.
[0034] The TV set 4 can be connected to the video output 39 and the
audio output 42 and is adapted to reproduce an information signal
I.
[0035] The arrangement 1 in accordance with the invention now
comprises interrogation means for independently requesting a
playing authorization. These interrogation means include
communication means 43, which in the absence of a playing
authorization for a reproduced encrypted information signal, which
is characterized by the appearance of control information SI, are
capable of establishing a data link to at least a playing
authorization allocation device of the playing authorization
allocation means 5. For this purpose, control information SI
available on the control information output 40 of the first decoder
means 36 can be applied to a control unit 44 of the communication
means 43. Furthermore, enable information E available on the enable
output 28 of the processing stage 21 can be applied to the control
unit 44. The communication means 43 further comprise memory means
45 connected to the control unit 44 and adapted to store connection
set-up information of playing authorization allocation devices 5 of
the playing authorization allocation means, which devices are
characterized by enable information E. Connection setup information
can be formed by a telephone number of a playing authorization
allocation device, a given address in a radio communication network
or by a given reverse channel of a cable system, as will be
described in more detail hereinafter.
[0036] For the communication with a playing authorization
allocation device of the playing authorization allocation means 5
the communication means 43 comprise a first communication stage 46,
a second communication stage 47 and a third communication stage 48.
In the present case, the first communication stage 46 is formed by
a so-called modem, which is adapted to establish a data link formed
by a telephone connection 49. To set up a telephone link 49 the
first communication stage 46 has an input 50 arranged to receive
connection set-up information in the form of a telephone number of
a charge collection device which at the same time constitutes a
first playing authorization allocation device 51 of the playing
authorization allocation means 5. Moreover, connection set-up
information in the form of a further telephone number can be
applied to the input 50 of the first communication stage 46, by
means of which a further telephone link 52 can be set up between
the first communication stage 4 and a first broadcasting station
which at the same time constitutes a second playing authorization
allocation device 53 of the playing authorization allocation means
5. The first broadcasting station is adapted to transmit TV
programs in the form of encrypted or non-encrypted information
signals I by satellite via a satellite link 54. Furthermore, the
first broadcasting station is allowed or authorized to issue
playing authorizations for pay television programs transmitted by
the first broadcasting station, which programs are recorded in a
recording and reproducing device and can be reproduced at a later
instant.
[0037] Connection set-up information in the form of an address in a
radio communication network can be applied to an input 54 of the
second communication stage 47. Using the address in a radio
communication network, the second communication stage 47 is adapted
to set up a data link in the form of an microwave link 56 between
the second communication stage 47 and a second broadcasting station
which at the same time forms a third playing authorization
allocation device 57 of the playing authorization allocation means
5. For this purpose, the second communication stage 47 can supply
microwave signals to a microwave antenna 58. Such microwave links
between a broadcasting station and a set-top box are known as
"wireless cable" radio links. The second broadcasting station 57 is
adapted to transmit TV programs consisting of encrypted or
non-encrypted information signals I via the microwave link 56 and
is allowed and authorized to allocate playing authorizations for TV
programs which are transmitted by the second broadcasting station,
which are recorded in a recording and reproducing device and which
are reproducible at a later instant.
[0038] The third communication stage 48 is adapted to set up a data
link to a cable TV service unit 60 via a cable TV system 59, which
cable TV service unit also forms a broadcasting station and a
fourth playing authorization allocation device 60 of the playing
authorization allocation means 5. For this purpose, an input 61 of
the third communication stage 48 is arranged to receive channel
information which characterizes the reverse channel for the
transmission of information to the cable TV service unit. The cable
TV service unit is adapted to transmit TV programs consisting of
encrypted or non-encrypted information signals I via the cable TV
system 59 and is allowed and authorized to allocate playing
authorizations for pay TV programs which are transmitted by the
cable TV service unit, which are recorded in a recording and
reproducing device and which are reproducible at a later
instant.
[0039] All the connection set-up information--the first and the
second telephone number, the address in a radio communication
network and the channel information--is stored in the memory means
45 in such a manner that when enable information E characterizing
one of the playing authorization allocation devices 51, 53, 57 and
60 of the playing authorization allocation means 5 appears the
control unit 44 causes the relevant connection set-up information
to be read from the memory means 45. The connection set-up
information thus read enables a data link to be set up from the
communication means 43, i.e. the arrangement 1, to the playing
authorization allocation device 51, 53, 57 or 60 identified by the
enable information E. The control unit 44 is adapted to supply
connection set-up information read from the memory means 45 to the
input 50 of the first communication stage 46, or to the input 55 of
the second communication stage 47, or to the input 61 of the third
communication stage 48 in dependence upon the type of connection
set-up information that has been read. Connection set-up
information in the form of telephone numbers is then supplied to
the first communication stage 46, connection set-up information in
the form of addresses in a radio communication network is supplied
to the second communication stage 47, and connection set-up
information in the form of channel information is supplied to the
third communication stage 48.
[0040] When an encrypted paid-service information signal I is to be
played from a purchased prerecorded DVHS cassette by means of the
DVHS video recorder 2 and the first key information S1 required for
the decryption of the second key information S2 contained in the
paid-service information signal I is not stored in the membership
card of the key stage 22 no playing authorization exists. When a
purchased or a freely distributed prerecorded DVHS has been
manufactured by a firm which has transferred the collection of
charges for playing of the encrypted paid-service information
signal I recorded on the prerecorded DVHS cassette to the charge
collection device which is formed by the first playing
authorization allocation device 51, the information signal recorded
on this DVHS contains enable information which identifies this
first playing authorization allocation device 51.
[0041] By actuating the play button 7 the DVHS video recorder 2 can
be set to the play mode to reproduce the encrypted paid-service
information signal from the DVHS cassette in the DVHS video
recorder. The reproduced encrypted information signal I can be
applied to the information signal input 20 and eventually to the
processing stage 21 of the verification means 19 via the first
interface means 11, the bus connection 12 and the second interface
means 13. The enable information E contained in the reproduced
encrypted information signal I is detected by the processing stage
21 and is applied to the enable output 28. In a manner not shown in
FIG. 1 the user of the arrangement 1 may be prompted to insert a
membership card 29 made available by the first playing
authorization allocation device 51.
[0042] If the membership card 29 does not contain the correct first
key information S1 and there is consequently no playing
authorization for the encrypted information signal I reproduced
from the prerecorded DVHS cassette, the decryption means 32 cannot
produce a decrypted information signal I on the output 33. As a
consequence, the video information signal blocks in the reproduced
encrypted information signal I cannot be decoded correctly, as a
result of which the first decoder means 36 supply control
information SI to the control unit 44. The enable information E
detected by the processing stage 21 and available on the enable
output 28 of this stage is also applied to the control unit 44. The
control unit 44 then reads the first telephone number from the
memory means 45 in order to set up the telephone link 49 to the
first playing authorization allocation device 51 identified by the
enable information E and transfers this first telephone number to
the first communication stage 46. The first communication stage 46
forms by a modem dials the first telephone number of the first
playing authorization allocation device 51 and thus sets up the
telephone link 49. After a successful set-up of the telephone link
49 the control unit 44 can supply playing authorization request
information to the first playing authorization allocation device 51
via the first communication stage 46 and via the first telephone
link 49.
[0043] With the aid of the playing authorization request
information the first playing authorization allocation device 51,
which is formed by the charge collection device, checks whether it
is possible to collect the charges via an existing membership of
the owner of the membership card 29 with the first playing
authorization allocation device 51. On the basis of the playing
authorization request information, which includes for example the
date of recording of the information signal I to be reproduced, the
first playing authorization allocation device 51 can determine
first key information S1, which first key information S1 is
necessary, in conjunction with the second key information S2
contained in the paid-service information signal I, to form
composite key information S suitable for the correct decryption of
the reproduced encrypted paid-service information signal I. If a
possibility of collecting charges from the owner of the membership
card 29 exists in the first playing authorization allocation device
51 and if the appropriate first key information S1 has been
detected, the first playing authorization allocation device 51 can
give a playing authorization by transferring the first key
information S1 to the control unit 44 of the communication stage 43
via the first telephone link 49 and the first communication stage
46. When first key information S1 is available in the control unit
44 the control unit 44 can apply the first key information S1 to
the first key input 30 of the key stage 22. When first key
information S1 appears in the key stage 22 the key stage 22 is
enabled to overwrite first key information S1 previously stored in
the membership card 29 with the key information S1 received at the
key input 30. The key stage 22 is adapted to supply composite key
information S, which is suitable for correctly decrypting the
reproduced encrypted paid-service information signal I, to the
decryption means 32. As a result, the decryption means can decrypt
the reproduced encrypted information signal I with the aid of the
composite key information S and the processing means 35 can process
the reproduced information signal I into a video information signal
available at the video output 39 and an audio information signal
available at the audio output 42.
[0044] Thus, the arrangement 1 in accordance with the invention is
suitable for independently requesting a playing authorization. When
first key information S1, which represents a playing authorization,
is received the arrangement 1 is enabled to decrypt a reproduced
information signal I. Manipulation by non-authorized persons is
ruled out almost completely because characteristic billing
information, which specifies the number of playing events of
paid-service information signals, is generated in the first playing
authorization allocation device device 51 upon reception of playing
authorization request information and can therefore not be altered
illegally by a user of the arrangement 1. Furthermore, charging of
the fees to the user of the arrangement 1 in accordance with the
invention can be effected at comparatively short time intervals and
with a particularly low expenditure by means of the first playing
authorization allocation device device 51, i.e. the playing
authorization allocation device. The first playing authorization
allocation device 51 can then handle the collection of charges for
a multitude of prerecorded DVHS cassettes and other digital
recording media. This advantage of the common collection of charges
is attainable particularly in that the enable information E
contained in each paid-service information signal I identifies a
respective playing authorization allocation device which is allowed
and authorized to allocate a playing authorization.
[0045] Moreover, it is very advantageous that setting-up the data
link, supplying the playing authorization request information and
obtaining the playing authorization up to the correct decryption of
the reproduced encrypted paid-service information signal I can be
effected within a very short time interval, as a result of which
the user of the arrangement 1 in accordance with the invention has
to wait only very briefly for the reproduction of the paid-service
information signal.
[0046] A further advantage of the charge collection is that a
manufacturer of prerecorded data carriers--such as DVHS cassettes,
DVDs or CD-ROMs--can give a prerecorded data carrier to customers
and can receive earnings through the charge collection each time
that the prerecorded record carrier is played.
[0047] In a second example of an application an encrypted
paid-service information signal I can be reproduced from a DVD 16
by means of the DVD apparatus 3. The enable information E contained
in the reproduced encrypted information signal I identifies the
first broadcasting station as a second playing authorization
allocation device 53 authorized to allocate a playing
authorization. In the absence of a playing authorization, which--as
already explained hereinbefore--is characterized by the occurrence
of control information SI, the communication means are capable of
setting up a data link, which is formed by the telephone link 52,
to the first broadcasting station identified by the enable
information E. The communication means 43 are further adapted to
supply playing authorization request information to the first
broadcasting station via the telephone link 52 and to receive a
playing authorization for the reproduced encrypted information
signal I from the first broadcasting station via the telephone link
52. After the first key information S1 which represents the playing
authorization has been received and after the first key information
S1 has been stored in the membership card 29 the encrypted
paid-service information signal I can be decrypted correctly in the
decryption means 32 and can be reproduced by means of the TV set
4.
[0048] In a third example of an application enable information E,
which is contained in a reproduced encrypted paid-service
information signal I and which is reproduced from a hard-disc drive
of a computer, not shown in FIG. 1, identifies the second
broadcasting station as the third playing authorization allocation
device device 57 for the reproduced encrypted paid-service
information signal I. In the present case playing authorization
request information is transferred from the control unit 44 to the
second broadcasting station via the second communication stage 47
and the microwave antenna 58 by means of the microwave link 56. In
the case of a playing authorization allocated by the second
broadcasting station this authorization is transferred to the
control unit via the microwave link 56, the microwave antenna 58
and the second communication stage 47 and is stored in the
membership card 29, thus enabling a correct decryption of the
reproduced encrypted information signal S1.
[0049] In a further example of an application enable information E,
which is contained in an encrypted paid-service information signal
I reproduced from a DVD by means of a DVD apparatus 3, identifies
the cable TV service unit, i.e. the fourth playing authorization
allocation device 60. In the present case playing authorization
request information, which identifies paid-service information
signal to be reproduces, is transmitted to the cable TV service via
the cable TV system 59 over the reverse channel identified by the
channel information. The cable TV service unit can transmit first
key information S1 representing a playing authorization to the
communication means 43 over the same channel or another channel of
the cable TV system 59.
[0050] Thus, the communication means 43 of the arrangement 1 in
accordance with the invention are adapted to supply playing
authorization request information which identifies the reproduced
encrypted information signal I and to receive first key information
S1, which depends on the playing authorization request information,
from at least one playing authorization allocation device. This
yields the advantage that on the basis of the playing authorization
request information each playing authorization allocation device
can detect which paid-service information signal I is to be
reproduced by the user of the arrangement 1. Thus, it is possible,
for example, to charge a higher fee for a particularly popular
movie recorded on a prerecorded DVHS video cassette than for a less
popular movie. Moreover, the amount to be charged can depend on
whether a movie to be played has already been played several times
by the owner of the membership card and a quantity discount can be
granted.
[0051] The arrangement 1 further includes control means 62 to which
the control information SI from the control information output 40
of the first decoder means can be applied in the absence of a
playing authorization. The control means 62 can further receive
playing authorization information WB from the control unit 44,
which information is supplied by the control unit 44 when first key
information S1 supplied by a playing authorization allocation
device is available. In the absence of a playing authorization for
a paid-service information signal I reproduced by the DVHS video
recorder 2, which absence is characterized by the occurrence of
control information SI, the control means 62 are adapted to supply
pause information to the DVHS video recorder 2 via the second
interface means 13, the bus connection 12 and the first interface
means 11 in order to interrupt the reproduction of the paid-service
information signal. Moreover, if subsequently a playing
authorization is present for the paid-service information signal I
reproduced by the DVHS video recorder 2, which presence is
characterized by the occurrence of playing authorization
information WB, the control means 62 are adapted to supply
end-of-pause information to the DVHS video recorder 2 via the
second interface means 13, the bus connection 12 and the first
interface means 11 and to set the DVHS video recorder 2 to the play
mode. Similar pause information and end-of-pause information can be
applied to any reproducing device--i.e. also to the DVD apparatus
3--which is connected to the second interface means 13 via the bus
connection 12 and which reproduces an encrypted information signal
I.
[0052] This yields the advantage that the reproduction of a
paid-service information signal I is interrupted until a playing
authorization from a playing authorization allocation device device
is available and the user of the arrangement 1 consequently does
not miss any part of the paid-service information signal I when
this is reproduced.
[0053] The arrangement 1 further includes receiving means 63 for
receiving an encrypted or non-encrypted information signal I from a
plurality of broadcasting stations. For this purpose, a tuner stage
64 of the receiving means 63 is adapted to receive information
signals I from the cable TV service unit, i.e. the fourth playing
authorization allocation device 60, via the cable TV system 59 and
from the second broadcasting station, i.e. the third playing
authorization allocation device 57, via the microwave link 56 and
the microwave antenna 58. Furthermore, the tuner stage 64 is
adapted to receive information signals I from a third broadcasting
station 65 via a terrestrial radio link 66 and a terrestrial
antenna 68 provided in an antenna stage 67. In addition, the tuner
stage 64 can receive information signals I from the first
broadcasting station 53 via the satellite radio link 54 and a
satellite antenna 69 of the antenna stage 67.
[0054] Channel control information K, which can be generated by the
entry means 26 through actuation of the up button 24 or the down
button 25, can be applied to the tuner stage 64 and to the control
input 23 of the processing stage 21. Depending on the channel
control information K an information signal I received in the tuner
stage 64 is applied to the information signal input 20 of the
verification means 19. An information signal I applied to the
information signal input 20 can be supplied to the processing stage
21. In the processing stage 21--as already explained
hereinbefore--the information signal blocks of the video channel
and the associated audio channel selected by means of the up button
24 and the down button 25 as well as the additional information
associated with the information in these two channels--particularly
the corresponding enable information E and the second key
information S2--are selected on the basis of the channel control
information K. The selected information can be made available on
the information signal output 27. A information signal I available
on the information signal output 27--which signal can be a
paid-service information signal I, which is consequently encrypted
and which then contains enable information E which identifies a
playing authorization allocation device allowed to allocate a
playing authorization for the encrypted information signal I--can
be supplied to the second interface means 13 of the arrangement 1.
It is to be noted that it is also possible to select a plurality of
video channels, audio channels as well as additional information
associated with the information in these two channels and to record
all this information by means of the DVHS video recorder 2.
[0055] First key information S1 contained in the information signal
received from a broadcasting station can be detected in the
processing stage 21 and can be applied to the second key input 31
of the key stage 22 in order to store the first key information S1
in the membership card 29.
[0056] By actuating the record button 8 of the entry means 6 of the
DVHS video recorder 2, which constitutes a recording and
reproducing device, the DVHS video recorder 2 can be set to a
recording mode. When the recording mode is active the DVHS video
recorder 2 can record information signals I, which are applied from
the second interface means 13 to the first interface means 11 via
the bus connection 12, on the magnetic tape 9 of a DVHS cassette
via the operating connection 10. An encrypted paid-service
information signal I recorded by means of the DVHS video recorder 2
can be played back in a reproducing mode activated by actuation of
the play button 7, as already set forth hereinbefore.
[0057] This yields the advantage that also for a movie transmitted
by a broadcasting station and recorded on a DVHS cassette by the
DVHS video recorder 2 the broadcasting station can be charge a fee
for each reproduction of the pay movie.
[0058] In this respect, it is to be noted that a playing
authorization for a paid-service information signal I supplied by
the third broadcasting station 65 can be granted by the charge
collection device, i.e. the first playing authorization allocation
device 51, which is allowed by the third broadcasting station 65 to
allocate playing authorizations.
[0059] It is to be noted that all the playing authorization
allocation devices include memory means capable of storing
information about all the paid-service information signals I for
which the respective playing authorization allocation device is
allowed and authorized to allocate a playing authorization. This
information includes in particular identification information,
which is likewise contained in playing authorization request
information and which identifies the information signal I to be
reproduced. Moreover, for the identification information
identifying each paid-service information signal it is possible to
store associated first key information S1 for decrypting the
encrypted information signal as well as billing information which
indicates the amount to be charged for the relevant paid-service
information signal.
[0060] It is to be noted that the memory means 45 may already
contain connection set-up information when an arrangement 1 in
accordance with the invention is purchased. Moreover, connection
set-up information for a new playing authorization allocation
device can be stored on an associated membership card 29, which
information can be supplied to the control unit 44 via a connection
not shown in FIG. 1 in order store the connection set-up
information in the memory means 55 when the membership card 29 is
inserted into the key stage 22. Furthermore, a new playing
authorization allocation device can supply the corresponding
connection set-up information to the arrangement 1 via a data link
in order to store the connection set-up information in the memory
means 45.
[0061] It is to be noted that the communication means can also be
adapted to set up a data link to an internet network server which
constitutes a playing authorization allocation device.
[0062] Furthermore, it is to be noted that an arrangement in
accordance with the invention can also be built directly into a
video recorder, or in a DVD apparatus, or in a TV receiver.
[0063] In the embodiment described hereinbefore by way of example
the interrogation means for independently requesting a playing
authorization for a reproduced encrypted information signal
basically comprise the communication means 43 and the processing
means 35, of which the first decoder means 36 at the same time
serve as detection means for detecting an encrypted and a
non-encrypted or decrypted information signal. Such a construction
of the interrogation means has proved to be particularly
advantageous in practice. However, it is to be noted that
alternatively an arrangement in accordance with the invention may
comprise differently constructed interrogation means. Such
interrogation means can be, for example, means in which the first
decoder means for decoding encoded video information signal blocks
are not used at the same time as detector means for detecting
encrypted or non-encrypted information signals but in which
separate detector means are provided by which encrypted or
non-encrypted information signals can be detected. It is likewise
possible to provide interrogation means with communication means
having another circuit design than in the arrangement in accordance
with the invention described with reference to FIG. 1.
* * * * *