Streaming system and streaming method

• US 20050108746A1
• Filed: 10/29/2003
• Published: 05/19/2005
• Est. Priority Date: 11/01/2002
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Horiguchi, Masato, Sakaguchi, Tatsumi, Futagami, Motomasa
• Granted Patent: US 8,572,380 B2
• Time in Patent Office: Days
• US Class Current: 725/31
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/0457 wherein the sending and receiving network entities apply dynamic encryption, e.g. stream encryption cryptographic mechanisms or cryptographic arrangements for stream encryption H04L9/065
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838
• CPC Class Codes: H04L 63/12 Applying verification of the received information cryptographic mechanisms or cryptographic arrangements for data integrity or data verification H04L9/32
• CPC Class Codes: H04L 63/164 at the network layer
• CPC Class Codes: H04L 65/1104 Session initiation protocol [SIP]
• CPC Class Codes: H04L 65/612 for unicast
• CPC Class Codes: H04L 65/70 Media network packetisation
• CPC Class Codes: H04L 65/762 at the source reformatting of additional data in video distribution servers H04N21/2355
• CPC Class Codes: H04L 9/00 Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
• CPC Class Codes: H04N 21/2347 involving video stream encryption
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 21/4405 involving video stream decryption
• CPC Class Codes: H04N 21/6437 Real-time Transport Protocol [RTP]
• 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

A streaming system includes an authoring unit (2), a stream server (3) and a client terminal (5). The authoring unit generates a file composed of encrypted contents data and the ancillary information at least containing the packetizing control information for generating an RTP packet, a non-encrypted codec dependent header made up of the information pertinent to encoded contents data, and the encryption information for decrypting the encrypted contents data form packet to packet. The streaming server packetizes the encrypted contents data along with at least the codec dependent header and distributes the resulting data as a stream. The client terminal refers to the codec dependent header of the received packet, re-assembles the packet, and decrypts the encrypted contents data of the re-assembled packet to generate contents data.

Claims

1. A streaming system comprising:

stream distribution means for packetizing encrypted contents data, obtained on encrypting contents data, obtained on encoding picture data and/or speech data, along with at least non-encrypted encoding information specifying the information pertinent to encoding of said contents data, and distributing the resulting data as a stream; and

stream receiving means for receiving said packet from said stream distribution means, re-assembling the received packet based on the non-encrypted encoding information and decrypting the encrypted contents data of the re-assembled packet to generate the contents data.

2. The streaming system according to claim 1, wherein said encrypted contents data are data obtained on encrypting the contents data without changing the data length thereof.

3. The streaming system according to claim 1, wherein said stream distributing means includes:

an authoring device having ancillary information generating means for generating the ancillary information at least containing said encoding information and the packetizing control information for managing control for generating a packet of a preset form, and encrypted contents data generating means for generating encrypted contents data which is said contents data encrypted; and

a streaming server for packetizing said encrypted contents data along with at least said non-encrypted encoding information, based on said packetizing control information formed by said authoring device, and distributing the resulting packetized data.

4. The streaming system according to claim 3, wherein said encrypted contents data are data obtained on encrypting the contents data without changing the data length thereof.

5. The streaming system according to claim 3,

wherein said ancillary information generating means generates the encryption information specifying the information for packet-based decryption of said encrypted contents data, and

wherein said streaming server packetizes said encrypted contents data along with at least said encryption information and the non-encrypted encoding information, based on said packetizing control information, and distributes the resulting packetized information.

6. The streaming system according to claim 3,

wherein said ancillary information generating means generates the transmission protocol information specifying the information pertinent to the transmission protocol for streaming;

and

wherein said streaming server packetizes said encrypted contents data along with at least said transmission protocol information and the non-encrypted encoding information, based on said packetizing control information, and distributes the resulting packetized information.

7. The streaming system according to claim 3,

wherein said ancillary information generating means generates the authentication information specifying the information pertinent to authentication;

and

wherein said streaming server packetizing said encrypted contents data along with at least said authentication information and the non-encrypted encoding information, based on said packetizing control information, and distributes the resulting packetized information.

8. The streaming system according to claim 1, wherein said packet is made up by the transmission protocol information specifying the information pertinent to the transmission protocol for streaming, the encryption information specifying the information for decrypting said encrypted contents data, the non-encrypted encoding information and said encrypted contents data.

9. The streaming system according to claim 1, wherein said stream receiving means decrypts said contents data, the encrypted contents data of which has been decrypted, to the original picture data and/or the speech data.

10. The streaming system according to claim 1, wherein said stream distribution means includes:

a provider owning the copyrights of said picture data and/or the speech data; and

a license management server managing said copyrights; and

wherein said stream receiving means, on making a request to said provider for viewing said contents data, acquiring the permission of viewing said contents data from said license management server.

11. A streaming method for distributing data from stream distributing means to stream receiving means, comprising:

a stream distribution step of packetizing encrypted contents data, obtained on encrypting contents data, obtained on encoding picture data and/or speech data, along with at least the non-encrypted encoding information specifying the information pertinent to encoding of said contents data, and distributing the resulting data as a stream by said stream distributing means; and

a stream receiving step of receiving said packet from said stream distribution step, re-assembling the received packet based on the non-encrypted encoding information and decrypting the encrypted contents data of the re-assembled packet by said stream receiving means to generate the contents data.

12. The streaming method according to claim 11, wherein said encrypted contents data are data obtained on encrypting the contents data without changing the data length thereof.

13. The streaming method according to claim 11, wherein said stream distributing step includes:

an authoring step composed of an ancillary information generating step of generating the ancillary information at least containing said encoding information and the packetizing control information for managing control for generating a packet of a preset form, and an encrypted contents data generating step of generating encrypted contents data which is said contents data encrypted;

a data distributing step of packetizing said encrypted contents data, along with at least said non-encrypted encoding information, based on said packetizing control information formed in said authoring step and distributing the resulting packetized data.

14. The streaming method according to claim 13, wherein said encrypted contents data are data obtained on encrypting the contents data without changing the data length thereof.

15. The streaming method according to claim 13,

wherein said ancillary information generating step generates the encryption information specifying the information for packet-based decryption of said encrypted contents data, and

wherein said data distributing step packetizes said encrypted contents data along with at least said encryption information and the non-encrypted encoding information, based on said packetizing control information, and distributes the resulting packetized information.

16. The streaming method according to claim 13,

wherein said ancillary information generating step generates the transmission protocol information specifying the information pertinent to the transmission protocol for streaming;

and

wherein said data distributing step packetizes said encrypted contents data along with at least said transmission protocol information and the non-encrypted encoding information, based on said packetizing control information, and distributes the resulting packetized information.

17. The streaming method according to claim 13,

wherein said ancillary information generating step generates the authentication information specifying the information pertinent to authentication;

and

wherein said streaming server packetizes said encrypted contents data along with at least said authentication information and the non-encrypted encoding information, based on said packetizing control information, and distributes the resulting packetized information.

18. The streaming method according to claim 11, wherein said packet is made up by the transmission protocol information specifying the information pertinent to the transmission protocol for streaming, the encryption information specifying the information for decrypting said encrypted contents data, the non-encrypted encoding information and said encrypted contents data.

19. An authoring device comprising:

ancillary information generating means for generating the ancillary information composed of the non-encrypted encoding information specifying the information pertinent to encoding of contents data obtained on encoding the picture data and/or the speech data, and the packetizing control information for managing control for forming a packet of a preset format; and

encrypted contents data generating means for generating encrypted contents data, obtained on encrypting said contents data.

20. The authoring device according to claim 19, wherein said encrypted contents data generating means encrypts said contents data without changing the data length thereof.

21. The authoring device according to claim 19, wherein said ancillary information generating means generates the encryption information specifying the information for decrypting said encrypted contents data from packet to packet.

22. The authoring device according to claim 19, wherein said ancillary information generating means includes:

packetizing control information generating means for generating said packetizing control information;

first header generating means for generating a codec dependent header, which depends on the encoding of said contents data, based on said contents data; and

second header generating means for generating a cryptoheader based on said packetizing control information and said codec dependent header.

23. An authoring method comprising:

an ancillary information generating step of generating the ancillary information composed of the non-encrypted encoding information specifying the information pertinent to encoding of contents data obtained on encoding the picture data and/or the speech data, and the packetizing control information for managing control for forming a packet of a preset format; and

an encrypted contents data generating step of generating encrypted contents data, obtained on encrypting said contents data.

24. The authoring method according to claim 23, wherein said encrypted contents data generating step encrypts said contents data without changing the data length of said contents data.

25. The authoring method according to claim 23, wherein said ancillary information generating step generates the information for decrypting the encrypted contents data from packet to packet.

26. The authoring method according to claim 23, wherein said ancillary information generating step includes:

a packetizing control information generating step of generating said packetizing control information;

a first header generating step of generating a codec dependent header, which depends on the encoding of said contents data, based on said contents data; and

a second header generating step of generating said cryptoheader based on said packetizing control information and said codec dependent header.

27. A program for having a computer execute preset operations, said program comprising:

an ancillary information generating step of generating the ancillary information composed of the non-encrypted encoding information specifying the information pertinent to encoding of contents data obtained on encoding picture data and/or speech data, and the packetizing control information for managing control for forming a packet of a preset format; and

an encrypting step of generating encrypted contents data obtained on encrypting said contents data.

28. A streaming server comprising:

packetizing means for packetizing encrypted contents data, obtained on encrypting contents data, obtained on encoding picture data and/or speech data, along with at least the non-encrypted encoding information, specifying the information pertinent to encoding of said contents data, and distributing the resulting data as a stream; and

data distributing means for distributing said packet as a stream.

29. The streaming server according to claim 28, wherein said encrypted contents data have been encrypted without changing the data length thereof.

30. The streaming server according to claim 28, wherein said packetizing means is supplied with said encrypted contents data and with the ancillary information, said ancillary information being formed by the packetizing control information for managing control for forming a packet of a preset format, the encryption information specifying the information for decrypting at least said encrypted contents data from packet to packet and the non-encrypted encoding information specifying the information pertinent to said encoding of the contents data, said encryption information and the non-encrypted encoding information being appended to said packetizing control information;

said packetizing means packetizing said encrypted contents data along with said encryption information and said non-encrypted encoding information based on said packetizing control information.

31. A data distributing method comprising:

a step of packetizing encrypted contents data, obtained on encrypting contents data, obtained on encoding picture data and/or speech data, along with at least the non-encrypted encoding information specifying the information pertinent to encoding of said contents data; and

a step of distributing the resulting data as a stream.

32. The data distributing method according to claim 31, wherein said encrypted contents data are data obtained on encrypting the contents data without changing the data length thereof.

33. The data distributing method according to claim 31, wherein said packetizing step is supplied with said encrypted contents data and with the ancillary information, said ancillary information being formed by the packetizing control information for managing control for forming a packet of a preset format, the encryption information specifying the information for decrypting at least said encrypted contents data from packet to packet and the non-encrypted encoding information specifying the information pertinent to said encoding of the contents data, said encryption information and the non-encrypted encoding information being appended to said packetizing control information;

said packetizing step packetizing said encrypted contents data along with said encryption information and said non-encrypted encoding information based on said packetizing control information.

34. A program for having a computer to execute preset processing, said program comprising:

a step of packetizing encrypted contents data, obtained on encrypting contents data, obtained on encoding picture data and/or speech data, along with at least the non-encrypted encoding information specifying the information pertinent to encoding of said contents data, and

a step of distributing said packet as a stream.

35. A client terminal comprising:

receiving means for receiving a packet distributed, said packet being the packetized encrypted contents data obtained on encoding and encrypting the picture data and/or the speech data and on packetizing the encoded and encrypted data along with the non-encrypted encoding information specifying the information pertinent to encoding;

re-assembling means for re-assembling said packet based on the non-encrypted encoding information contained in said received packet; and

decrypting means for decrypting the encrypted contents data of said re-assembled packet.

36. The client terminal according to claim 35, wherein said encrypted contents data are data obtained on encrypting the contents data without changing the data length thereof.

37. The client terminal according to claim 35,

wherein said packet is said encrypted contents data having appended thereto said non-encrypted encoding information and the encryption information for decrypting the encrypted contents data from packet to packet;

and

wherein said decrypting means decrypts said encrypted contents data based on said encryption information.

38. The client terminal according to claim 35, including communication means for communication with a provider having the copyrights for said contents data and with a license management server supervising the copyrights for said contents data;

said receiving means receiving a permission for viewing said contents data and said packet from said license management server after a request for viewing said contents data is transmitted to said provider through said communication means.

39. A data decrypting method comprising:

a receiving step of receiving a packet distributed, said packet being the packetized encrypted contents data obtained on encoding and encrypting the picture data and/or the speech data and on packetizing the encoded and encrypted data along with the non-encrypted encoding information specifying the information pertinent to encoding;

a re-assembling step of re-assembling said packet based on said non-encrypted encoding information contained in said re-assembled packet; and

a decrypting step of decrypting said encrypted contents data of said re-assembled packet.

40. The data decrypting method according to claim 39, wherein said encrypted contents data are data obtained on encrypting the contents data without changing the data length thereof.

41. The data decrypting method according to claim 39,

wherein said packet is said encrypted contents data having appended thereto said non-encrypted encoding information and the encryption information for decrypting said encrypted contents data from packet to packet;

and

wherein in said decrypting step, said encrypted contents data are decrypted based on said encryption information.

42. A program for having a computer execute preset processing, said program including:

a receiving step of receiving a packet distributed, said packet being the packetized encrypted contents data obtained on encoding and encrypting the picture data and/or the speech data and on packetizing the encoded and encrypted data along with the non-encrypted encoding information specifying the information pertinent to encoding;

a re-assembling step of re-assembling said packet based on said non-encrypted encoding information contained in said re-assembled packet; and

a decrypting step of decrypting said encrypted contents data of said re-assembled packet.