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:
Jul. 31, 2012
Filed:
Jun. 16, 2008
Qing LI, Sunnyvale, CA (US);
Qing Li, Sunnyvale, CA (US);
Hitachi, Ltd., Tokyo, JP;
Abstract
Slice-based prioritized secure video streaming comprises a transmitter receiving a slice comprising a plurality of macroblocks and selecting an encryption key based at least in part on a relative importance of secure transmission of the macroblocks. If the importance is high, a master key is selected. If the importance is medium, a first key derivable by applying a one-way function to the master key is selected. If the importance is low, a second key derivable by applying the one-way function to the first key is selected. The slice is encrypted using the encryption key. A receiver receives the encrypted slice, decrypts a header of the slice using the master key, to obtain an indication of a relative importance of secure transmission of the macroblocks. The receiver selects a decryption key based at least in part on the indication, and decrypts the slice using the decryption key.