The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 2005
Filed:
Mar. 23, 2000
Eric M. Foster, Owego, NY (US);
Dennis E. Franklin, Endicott, NY (US);
Wai Man Lam, Moheganlake, NY (US);
Raymond E. Losinger, Endicott, NY (US);
Chuck H. Ngai, Endwell, NY (US);
Eric M. Foster, Owego, NY (US);
Dennis E. Franklin, Endicott, NY (US);
Wai Man Lam, Moheganlake, NY (US);
Raymond E. Losinger, Endicott, NY (US);
Chuck H. Ngai, Endwell, NY (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
Copy protection is provided at a mass storage device provided in or connected to a decoder for receiving digital transmissions of audio and video program material by virtual scrambling of blocks of data. Non-sequential storage locations for blocks of data are defined in accordance with a key and the file allocation table is encrypted and stored. Thus blocks of data remain intact and need not be decrypted upon playback, reducing processing time, while the program is effectively protected from reassembly without decryption of the file allocation table. The key(s) may be maintained internally within the decoder and need not be shared, thus avoiding a need for user identification and/or authentication. Software for encryption, including keys may be downloaded to the decoder through the same transmission link used for transmission of data files that may be encrypted in response to control signals or flags transmitted with data files to be protected.