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:
May. 13, 2014
Filed:
Jul. 31, 2001
Eric Diehl, Liffré, FR;
Eric Diehl, Liffré, FR;
Thomson Licensing S.A., Cedex, FR;
Abstract
A content server maintains a database of different content files, these files being scrambled by control words that are stored in a database. The control words are necessary for descrambling the content files. When a device requests a content file, it sends a public key to the content server, along with the request. The content server encrypts the control words with the public key and transmits both the ciphered control words and the scrambled content file to the device. In one embodiment, the device decrypts the control words, and, when a further device on the home network requests a content file, sends the scrambled content file, along with the necessary control words encrypted with a local key that may have been provided by the further device.