Cryptography – Video cryptography – Video electric signal masking
Reexamination Certificate
2007-07-31
2007-07-31
Barrón, Jr., Gilberto (Department: 2132)
Cryptography
Video cryptography
Video electric signal masking
C380S239000, C380S240000
Reexamination Certificate
active
10342539
ABSTRACT:
A system provides improved security in a streaming media decoder includes decryption of encoded media information at the media layer, within a decoder component of a playback device. A content source, such as an MPEG-4 media stream from a network, or a file on a local storage device, etc. that contain packetized content, and supplies encrypted and encoded media information. For example, digital sound and image information can be conveyed for presentation. A reassembler component is used to initiate decryption of a nominal amount of information needed to perform further processing at the QuickTime player. Encrypted access units are sent from the reassembler to the decoder, where the decoder causes decryption of the access unit information. This approach prevents decrypted, encoded information from being transferred from the reassembler to the decoder. Such decrypted and encoded information is especially susceptible to copying. Instead, the information transferred from the reassembler to the decoder is largely still encrypted. In a preferred embodiment, an Internet Protocol rights management system (IPRM) is used to perform the decryption processing. The reassembler makes requests of the IPRM process to open a decryption session and decrypt selected packets to identify the window rendering size. The decoder makes requests of the IPRM process to decrypt access units within the same decryption session and to close the decryption session. Because content is encrypted on packet boundaries, and when called upon by the decoder, the IPRM component must recreate the packet boundaries from the access unit before decryption is possible. The IPRM system component is able to do so because the encrypted packets contain an IPRM header that is used by the IPRM system to calculate the packet length. After decrypting all the packets, the IPRM system component reconstructs the decrypted access unit and returns decrypted content to the decoder.
REFERENCES:
patent: 5535276 (1996-07-01), Ganesan
patent: 5706507 (1998-01-01), Schloss
patent: 5802518 (1998-09-01), Kitain et al.
patent: 5878135 (1999-03-01), Blatter et al.
patent: 6122377 (2000-09-01), Bromba et al.
patent: 6640145 (2003-10-01), Hoffberg et al.
patent: 2001/0018743 (2001-08-01), Morishita
patent: 2003/0135730 (2003-07-01), Szucs et al.
patent: 0 714 204 (1996-05-01), None
patent: 0715244 (1996-06-01), None
patent: 0 763 936 (1997-03-01), None
patent: 0 936 774 (1999-08-01), None
patent: 1041823 (2000-10-01), None
patent: 1041823 (2000-10-01), None
patent: 1089488 (2001-04-01), None
patent: 1150198 (2001-10-01), None
patent: 1 253 762 (2002-10-01), None
patent: WO 97 25798 (1997-07-01), None
patent: WO 00/11849 (2000-03-01), None
patent: WO 00/68764 (2000-11-01), None
patent: WO 01 33320 (2001-01-01), None
patent: WO 01/56249 (2001-08-01), None
patent: WO 01 98903 (2001-12-01), None
patent: WO 01/99374 (2001-12-01), None
patent: WO 03/045038 (2003-05-01), None
Ganesan, Ravi; “Yaksha: Augmenting Kerberos with Public Key Cryptography”; Proceedings of the Sympoisum on San Diego, CA.: 1995, pp. 132-143, XP01034533.
Kohl, J., et al.; “The Kerberos Network Authentication Service (V5)”; Network Working Group Request for Comments, 1993 pp. 1-97 No. 1510, XP002929784.
Christin, Nicolas; “Multicasting of Real-Time Data RTP, RTCP, RTSP”; 'Online! Nov. 9, 1999. Retrieved from the Internet: , URL:http://www.sims.berkeley.edu/christin/talks/rtp.pdf> retrieved on Nov. 3, 2003.
Schulzrinne, H., et al.; “RTP: A Transport Protocol for Real-Time Applications”; RFC 1889; 'Online! XP002260412; Retrieved from the Internet: ,URL:www.ietf.org>; retrieved on Nov. 3, 2003.
Diamand Joseph
Peterka Petr
Barrón Jr. Gilberto
Driscoll Benjamin D.
General Instrument Corporation
Perungavoor Venkat
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