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:
Oct. 29, 2013
Filed:
Jan. 19, 2009
Thomas Alexander Bellwood, Austin, TX (US);
Robert Glenn Deen, San Jose, CA (US);
Hongxia Jin, San Jose, CA (US);
Jeffrey Bruce Lotspiech, Henderson, NV (US);
Sigfredo Ismael Nin, Morgan Hill, CA (US);
Matthew Francis Rutkowski, Pflugerville, TX (US);
Thomas Alexander Bellwood, Austin, TX (US);
Robert Glenn Deen, San Jose, CA (US);
Hongxia Jin, San Jose, CA (US);
Jeffrey Bruce Lotspiech, Henderson, NV (US);
Sigfredo Ismael Nin, Morgan Hill, CA (US);
Matthew Francis Rutkowski, Pflugerville, TX (US);
International Business Machines, Armonk, NY (US);
Abstract
Embodiments of the invention relate to obtaining forensic information for an anonymous attack of digital content without variations in a broadcast encryption system. In one embodiment a media device, being configured to record digital content on recordable media, receives digital content, a unified media key block, and a recording key table. The device calculates a set of recording keys from the recording key table using a media key variant from the unified media key block. The device then generates a title key and encrypts by the digital content in the generated title key. The device then encrypts the generated title key in each one of the calculated recording keys, adds a header including the encrypted titles keys to the encrypted digital content, and stores the encrypted digital content with the header on recordable media.