Streaming system and streaming method

• US 8,583,927 B2
• Filed: 09/23/2011
• Issued: 11/12/2013
• Est. Priority Date: 11/01/2002
• Status: Expired due to Term

• Current Assignee: Sony Corporation (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.)
• Inventors: Futagami, Motomasa, Sakaguchi, Tatsumi, Horiguchi, Masato
• Primary Examiner(s): ARMOUCHE, HADI S
• Application Number:
  US13/243,694
• Publication Number:
  US 20120016958A1
• Time in Patent Office: 781 Days
• Field of Search: 713/170, 725/31, 725/135, 380/46, 380/277
• US Class Current: 713/170
• 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 receiving apparatus comprising:

a sending unit processing circuit configured to send a request for a contents data;

a receiving unit processing circuit configured to receive, in response to the request, one or more RTP packets from a streaming server;

a decryption unit processing circuit configured to decrypt an encrypted contents data included in each RTP packet received by the receiving unit by decrypting each packet individually using packet specific encryption information, the decryption being performed based on an independently assigned non-encrypted cryptoheader for each RTP packet; and

a re-assembling unit processing circuit configured to re-assemble the one or more RTP packets received by the receiving unit by using non-encrypted encoding related information included in the one or more RTP packets.

2. The receiving apparatus of claim 1, wherein the encrypted contents data included in the re-assembled one or more RTP packets, re-assembled by the re-assembling unit processing circuit, are decrypted by the decryption unit processing circuit.

3. The receiving apparatus of claim 1, wherein the encrypted contents data included in the one or more RTP packets, received by the receiving unit processing circuit, are first re-assembled by the re-assembling unit processing circuit and then decrypted by the decryption unit processing circuit.

4. The receiving apparatus of claim 1, wherein the receiving apparatus receives a license managed by a license management entity in order to access the encrypted contents data.

5. The receiving apparatus of claim 4, wherein said license includes at least one of a cipher key to decrypt the encrypted contents data and user rights of the contents data.

6. The receiving apparatus of claim 1, further comprising:

a decoder configured to decode the decrypted contents data.

7. The receiving apparatus of claim 6, wherein the order of data units in the encrypted contents data received by the receiving apparatus is different from the decoding order of the same data units.

8. A streaming system comprising:

a stream receiving apparatus comprising a sending unit processing circuit configured to send a request for a contents data;

a stream distribution apparatus configured to send, in response to the request, one or more RTP packets,

wherein said stream receiving apparatus further comprises;

a receiving unit processing circuit configured to receive one or more RTP packets,

a decryption unit processing circuit configured to decrypt an encrypted contents data included in each RTP packet by decrypting each packet individually using packet specific encryption information, the decryption being performed based on an independently assigned non-encrypted cryptoheader for each RTP packet, and

a re-assembling unit processing circuit configured to re-assemble the one or more RTP packets by using non-encrypted encoding related information included in the one or more RTP packets.

9. The system of claim 8, wherein the non encrypted encoding related information is a RTP payload header.

10. The system of claim 8, wherein the encrypted contents data is encrypted in accordance with a counter-mode encryption system.

11. A receiving apparatus comprising:

a sending unit processing circuit configured to send a request for a contents data comprising encoded picture data or speech data;

a receiving unit processing circuit configured

to receive, in response to the request, one or more RTP packets from a streaming server, each RTP packet comprising one or more data units, and

to receive a license from a license management entity, the license comprising at least one of a content encryption key to decrypt the encrypted contents data and user rights of the contents data;

a decryption unit processing circuit configured to decrypt encrypted contents data included in each RTP packet received by the receiving unit processing circuit by decrypting each packet individually using packet specific encryption information, the decryption being performed based on an independently assigned non-encrypted cryptoheader for each RTP packet; and

an assembling unit processing circuit configured to reorder and re-assemble the one or more RTP packets received by the receiving unit processing circuit by using non-encrypted encoding related information included in the one or more RTP packets.

12. The receiving apparatus of claim 11, wherein the non-encrypted cryptoheader comprises information pertinent to an Initialization Vector (IV).

13. The receiving apparatus of claim 11, wherein the content encryption key is provided directly or indirectly by a content provider.

14. The receiving apparatus of claim 11, wherein the licensing entity is at least one of a logical node and a physical node.

15. The receiving apparatus of claim 13, wherein each of the data units comprises an audio frame in case the contents data is encoded audio data.