Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files
Reexamination Certificate
2011-03-01
2011-03-01
Hewitt, II, Calvin L (Department: 3685)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Usage protection of distributed data files
C705S050000
Reexamination Certificate
active
07899752
ABSTRACT:
A method and system for preventing skipping the playback of a special content section of a digital media stream is provided. The method comprises a method for providing a digital media stream on the providing side, and a method for playing back a digital media stream as provided by the above providing method on the playing back side. The providing method comprises: decoding an encoded special content section of a digital media stream; generating an encryption key based on the decoded data of the special content section; encrypting a normal content section of the digital media stream using the encryption key; and providing the digital media stream comprising the encoded special content section and the encrypted normal content section. The playback method comprises: receiving the digital media stream; decoding the special content section of the digital media stream; generating an encryption key based on the decoded data of the special content section by using the same method for generating the encryption key in providing the digital media; decrypting the normal content section of the digital media stream using the encryption key; and playing back the special content section and normal content section of the digital media stream.
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“A Joint Signal Processing and Cryptographic Approach to Multimedia Encryption”, Yinian Mao and Min Wu, IEEE Transactions on Image Processing, vol. 15, No. 7, Jul. 2006, 15 pages.
Lin Guo Hui
Lin Yong Hua
Yang Yu Dong
Yuan Yu
Gibb I.P. Law Firm LLC
Hewitt II Calvin L
International Business Machines - Corporation
Nigh James D
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