Patent ID: 7519180
Filing Date: 2009-04-14
Classification: G11B,H04N

Abstract:
1. A method of copy protecting a content comprising: encoding a watermark in the content, wherein the watermark is not discernible by a recipient of the content, the watermark being indicative of a copy protection status of the content, wherein the watermark further indicates a level to which the content may be copied, and wherein the copy protection status of the content indicated by the watermark does not allow the recipient to record the content unless the recipient possesses a permission key that matches the watermark; transmitting the content with the encoded watermark to the recipient; and transmitting the permission key to the recipient, wherein the permission key is a variable permission key that varies over the transmission of the content and the encoded watermark such that more than one permission key is required to record the content and the encoded watermark, thereby allowing the recipient to record the content.