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:
Apr. 19, 2005
Filed:
May. 22, 2000
Jeffrey Bruce Lotspiech, San Jose, CA (US);
Ariel Virgil Mirles, San Jose, CA (US);
Dalit Naor, Palo Alto, CA (US);
Sigfredo Ismael Nin, Morgan Hill, CA (US);
Jeffrey Bruce Lotspiech, San Jose, CA (US);
Ariel Virgil Mirles, San Jose, CA (US);
Dalit Naor, Palo Alto, CA (US);
Sigfredo Ismael Nin, Morgan Hill, CA (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
A system for protecting content on recordable media for, e.g., DVD audio disks, flash memory media, or other media includes providing a media key block (MKB) on each media, with each MKB including 25,000 encryptions of a media key by 25,000 or so device keys. Each authorized player in the system has a single device key from among the system device keys with which to decrypt the media key. To avoid a coincidence attack in which a hacker can learn the MKB and associated media key and then guess at a device key without knowing its position in the MKB, the media key is XORed with a number representing each position in the MKB, and only then encrypted with the device key corresponding to that position.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile