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:
Jun. 28, 2011
Filed:
Jun. 27, 2006
Jason Charles Pelly, Reading, GB;
Jason Charles Pelly, Reading, GB;
Sony United Kingdom Limited, Weybridge, GB;
Abstract
A method of controlling copying of an information signal, comprises the steps of: prior to recordal and/or transmission, applying to the information signal a substantially imperceptible modification representing copy control data including a password securely encoded according to a predetermined algorithm; upon reproduction for copying by a user, deriving (S, S) the copy control data from the modified information signal; comparing (S, S, S, S, S) the derived securely encoded password with a reference password securely encoded according to a predetermined algorithm; and enabling (S) copying of the information signal if the securely encoded password derived from the information signal and the securely encoded reference password have a predetermined relationship, otherwise disabling copying (S). The reference password is sent to the user via a channel which is separate from a channel used to send the information signal to the user.