Recording and playback apparatus for stream data and transmission method for stream data

• US 20020114462A1
• Filed: 12/10/2001
• Published: 08/22/2002
• Est. Priority Date: 02/16/2001
• Status: Active Grant

• Current Assignee: Maxell, Ltd.
• Original Assignee: Hitachi, Ltd.
• Inventors: Okamoto, Hiroo, Kudo, Yoshimichi, Yoshioka, Atsushi, Owashi, Hitoaki
• Granted Patent: US 7,343,012 B2
• Time in Patent Office: Days
• US Class Current: 380/203
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 23/284 on the record carrier
• CPC Class Codes: G11B 31/00 Arrangements for the associated working of recording or reproducing apparatus with related apparatus with cameras or projectors G03B31/00 ; recording/reproducing of music for electrophonic musical instruments G10H1/0033; automatic arrangements for answering calls or for recording messages for absent subscribers H04M1/64; telephonic communication systems adapted for combination with dictation recording and playback systems H04M11/10; connection of TV recorder with other related apparatus, e.g. TV camera or receiver, in which the TV signal is significantly involved H04N, e.g. H04N23/00, H04N5/765; combination of radio or TV with other apparatus, e.g. with vehicles H05K11/00
• CPC Class Codes: H04L 12/2805 Home Audio Video Interoperability [HAVI] networks
• CPC Class Codes: H04L 12/2838 Distribution of signals within a home automation network, e.g. involving splitting/multiplexing signals to/from different paths adaptations of television systems for transmission by electric cable for domestic distribution H04N7/106; hybrid transport H04L12/6418; home network arrangements specially adapted for distribution of digital video signals H04N7/24
• CPC Class Codes: H04L 2012/2849 Audio/video appliances
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/4331 Caching operations, e.g. of an advertisement for later insertion during playback
• CPC Class Codes: H04N 5/913 for scrambling ; for copy protection
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

In transmission of stream data protected for copyright on a bus, transcription of stream data once recorded on a recording apparatus to a medium of another recording apparatus is realized. Authentication is carried out between a stream recording and playback apparatus and another recording apparatus to interchange a key for data scramble. By using this key, data is added with copy control information used when the data is recorded initially and thereafter the data is transmitted. After the data has been recorded on the recording apparatus, the data is deleted from an original recording medium. During transmission of the data, authentication from a different apparatus is rejected to prevent a plurality of copies from being made.

Claims

1. A stream data recording and playback apparatus comprising:

interface means for transmitting and receiving stream data and data for control;

a built-in or removable recording medium for recording received data;

encrypting means for performing a scramble process of data to be transmitted; and

decrypting means for performing a de-scramble process of the received data,

whereby key information for the scramble process or de-scramble process is interchanged by performing, through said interface means, an authentication process between the present apparatus and another apparatus for transmission or reception of stream data, data obtained by controlling the de-scramble process in accordance with copy control information added to the received stream data and information based on the copy control information are recorded on said recording medium, and stream data obtained by controlling the scramble process by said encrypting means in accordance with the information based on the copy control information read out of said recording medium and the copy control information are transmitted through said interface means,

wherein when the data de-scrambled by said decrypting means and thereafter recorded on said recording medium is read, scrambled by said encrypting means and transmitted as stream data from said interface means, the copy control information added to said stream data to be transmitted is changed depending on whether said data remains to be kept on said recording medium even after said data is read out or said data is deleted from said recording medium after said data is read out.

2. A stream data recording and playback apparatus according to claim 1,

wherein when said data is deleted after read out of said recording medium, said data is added with the same copy control information as that added when said data is recorded and is then transmitted as stream data from said interface means and when said data remains to be kept, stream data transmitted from said interface means is added with copy control information indicating that said stream data is prohibited from being recorded and is then transmitted.

14. A stream data recording and playback apparatus according to claim 1,

wherein said built-in recording medium is a hard disc drive.

15. A stream data recording and playback apparatus according to claim 1,

wherein said removable recording medium is a record erasable optical disc.

3. A stream data recording and playback apparatus comprising:

interface means for transmitting and receiving stream data and data for control;

a built-in or removable recording medium for recording received data;

encrypting means for performing a scramble process of data to be transmitted; and

decrypting means for performing a de-scramble process of the received data,

whereby a channel is established which is adapted to transmit the stream data onto a bus signal line connected to said interface means to permit data to be interchanged between the present apparatus and another apparatus, key data is interchanged which is necessary for carrying out authentication between the present apparatus and the transmission destination apparatus so as to cause said encrypting means to perform a scramble process of data to be transmitted on said channel or so as to cause said decrypting means to de-scramble the data, data obtained by controlling the de-scramble process in accordance with copy control information added to the received stream data and information based on the copy control information are recorded on said recording medium, and stream data obtained by controlling the scramble process by said encrypting means in accordance with information based on the copy control information read out of said recording medium and the copy control information are transmitted through said interface means,

wherein the data recorded on said recording medium is subjected to the scramble process by using said key data by means of said encrypting means and thereafter transmitted as stream data from said interface means through said channel, said data is deleted from said recording medium after read out, and authentication between the present apparatus and an apparatus other than the transmission destination apparatus is rejected during the transmission of said stream data.

9. A stream data recording and playback apparatus according to claim 3,

wherein when the data recorded on said recording medium is read and deleted, a command for inquiring the transmission destination apparatus about its operation status is transmitted repetitively, so that when it is confirmed by a response to said command that the transmission destination apparatus records the received stream, the data transmitted till then is deleted from said recording medium and when it is detected that said transmission destination apparatus interrupts the recording operation or when the transmission of the stream data fails to proceed, reading of the data is stopped and the data remaining on said recording medium at that moment is held as it is.

10. A stream data recording and playback apparatus according to claim 3,

wherein a channel for transmitting said stream data is established, authentication is carried out between the present apparatus and said transmission destination apparatus, a search for starting position of the data to be transmitted to said transmission destination apparatus is carried out, a command for commanding said transmission destination apparatus to start recording is transmitted and a stream applied with a scramble process beginning with a head portion of said data subject to the search of starting position is transmitted to said channel.

11. A stream data recording and playback apparatus according to claim 10,

wherein a command for commanding said transmission destination apparatus to pause recording after reading of data being transmitted to said transmission destination apparatus ends is transmitted to said transmission destination apparatus, a search for starting position of data to be transmitted next to said transmission destination apparatus is carried out, a command for commanding said other transmission destination apparatus to start recording is transmitted to said other transmission destination apparatus, and a stream applied with a scramble process beginning with a head portion of said data subject to the search for starting position is transmitted to said channel.

12. A stream data recording and playback apparatus according to claim 3 further comprising:

display means for displaying operation methods,

wherein a channel for transmitting said stream data is established, authentication is carried out between the present apparatus and said transmission destination apparatus, a search for starting position of data to be transmitted to said transmission destination apparatus is carried out, a message for causing said transmission destination apparatus to start recording is displayed by means of said display means, a stream applied with a scramble process beginning with a head portion of said data subject to the search for starting position is transmitted to said channel by an operation from the user.

17. A stream data transfer method according to claim 16 further comprising the steps of:

transmitting repetitively to said transmission destination apparatus a command for inquiring about its operation status during transmission of said stream data;

when it is confirmed from a response to said command that said transmission destination apparatus records the received stream, deleting data transmitted till then from said recording medium; and

when it is detected that said transmission destination apparatus pauses recording operation or the transmission of the stream data fails to proceed, stopping reading of the data and holding data remaining on said recording medium at that moment as it is.

18. A stream data transfer method according to claim 16,

wherein after the channel for transmission of stream data to the transmission destination apparatus is established and authentication between the present apparatus and said transmission destination apparatus is carried out, a command for starting recording operation is transmitted to said transmission destination apparatus in synchronism with start of the transmission beginning with a head portion of data to be transmitted to said transmission destination apparatus so as to cause said transmission destination apparatus to record said data beginning with its head portion.

19. A stream data transfer method according to claim 16,

wherein after the channel for transmission of stream data to the transmission destination apparatus is established and authentication is carried out between the present apparatus and said transmission destination apparatus, an indication for causing said destination apparatus to perform recording operation is given to the user, and the data to be transmitted to said transmission destination apparatus is made ready to start beginning with its head portion in response to the user operation and thereafter said transmission destination apparatus is caused to record said data beginning with its head portion.

4. A stream data recording and playback apparatus comprising:

interface means for transmitting and receiving stream data and data for control;

a built-in or removable recording medium for recording received data; and

encrypting means for performing a scramble process of data to be transmitted and decrypting means for performing a de-scramble process of the received data,

whereby a channel is established which is adapted to transmit stream data onto a bus signal line connected to said interface means to permit data to be interchanged between the present apparatus and another apparatus, key data is interchanged which is necessary for carrying out authentication between the present apparatus and the transmission destination apparatus so as to perform a scramble process of data to be transmitted on said channel or so as to de-scramble the data, data obtained by controlling the de-scramble process in accordance with copy control information added to stream data received by said interface means and information based on copy control information are recorded on said recording medium, stream data obtained by controlling the scramble process by information based on the copy control information read out of said recording medium and said copy control information are transmitted through said interface means,

wherein when the data read out of said recording medium is to be deleted after read out, a second channel other than the channel that has already been established is established, key data is interchanged which is necessary for carrying out authentication between the present apparatus and the transmission destination apparatus so as to perform a scramble process of data to be transmitted on said second channel or so as to de-scramble the data, the data recorded on said recording medium is subjected to the scramble process by using said key data and thereafter transmitted as stream data from said interface means through said second channel while being added with the same copy control information as that used when said data is recorded, and authentication tried by another apparatus to possess in common the key data used for said second channel is rejected during the stream data transmission on said second channel.

5. A stream data recording and playback apparatus according to claim 4,

wherein when said second channel is established, the channel that has already been established for transmission of the stream data is broken and stream transmission by only the second channel is carried out.

6. A stream data recording and playback apparatus according to claim 4,

wherein when said second channel is established, an empty packet is transmitted to the channel that has already been established for transmission of the stream data and stream transmission by only the second channel is carried out.

7. A stream data recording and playback apparatus according to claim 4,

wherein two channels of said second channel and said already established first channel are used to transmit stream data to be transmitted from said second channel by adding it with the same copy control information as that used when said data is recorded and to transmit stream data to be transmitted from said first channel by adding it with copy control information indicating that said stream data is prohibited from being recorded.

8. A stream data recording and playback apparatus according to claim 4,

wherein stream data is transmitted from said second channel to a recording apparatus for recording stream data and stream data is transmitted from said already established channel to a display apparatus for playing back and displaying stream data.

13. A stream data recording and playback apparatus having interface means for transmitting and receiving stream data and copy control information data, whereby key information for a scramble process or a de-scramble process is interchanged by performing an authentication process between the present apparatus and another apparatus for transmission or reception of stream data and the stream data is recorded on or played back from a built-in or removable recording medium,

wherein when received data is recorded on the recording medium after decrypted and de-scrambled and the recorded data is read out, encrypted and scrambled so as to be transmitted as stream data from said interface means, copy control information added to said stream data to be transmitted is changed depending whether said data remains to be kept on said recording medium even after read out or said data is deleted from said recording medium after read out.

16. A method of transferring stream data used in a stream data recording and playback apparatus having interface means for establishing a channel for data transmission between the present apparatus and another apparatus to transmit/receive stream data and data for control, a built-in or removable recording medium for recording received data, encrypting means for performing a scramble process of data to be transmitted and decrypting means for performing de-scramble process of received data, whereby key information for the scramble process or de-scramble process is interchanged by performing an authentication process between the present apparatus and the different apparatus for transmission and reception of stream data, data obtained by controlling the de-scramble process in accordance with copy control information added to the received stream data and information based on the copy control information are recorded on said recording medium and stream data obtained by controlling the scramble process in accordance with information based on the copy control information read out of said recording medium and the copy control information are transmitted through said interface means, said stream data transfer method comprising the steps of:

creating key data for performing a scramble process of data read out of said recording medium and establishing a channel for data transmission necessary to transmit stream data from said interface means;

performing authentication between the present apparatus and a stream data transmission destination apparatus to cause said apparatuses to possess said key data in common, scramble-processing data read out of said recording medium by using said key data by means of said encrypting means and transmitting the scrambled data as stream data from said interface means onto said data transmission channel while adding copy control information to that data; and

rejecting common possession of said key data based on a request for authentication made by an apparatus other than said transmission destination apparatus during transmission of the stream data carried out by using said transmission channel and after the transmission of the stream data ends, deleting from said recording medium the data read out of said recording medium and transmitted and braking said transmission channel and said key data.