Process for protecting contents transmitted as a stream of data, copy protection system for protecting content source device to protect the content, and the device display.

摘要

"The process to protect the content transmitted as a stream of data, copy protection system for protecting content source device to protect the content, and.The device display system of copyright protection.In order to protect the contents in which a pass depending on time is calculated (314) at a source device (330) by the combination of a checkpoint with a pass.The control point is transmitted (361) of a display device (340) to the source device prior to the source device transmitting (360) contents with the watermark for the device display.The control point is also stored (376) on the device display.Then, the source device transmits, to the display device, contents with the watermark, the pass, and the pass dependent on time.In the display device, the control point stored is compared (314) with a count current of a local clock (374), which was used to produce the point of control.If the control point stored is within a window of time of the clock place,Then the control point stored is combined (314 ') with the pass in the same way as the point of control is combined with the pass in the device source.A result of the combination is compared with the pass of time dependent and if the results match the pass dependent on time, then.The watermark and the pass can be compared to the usual way to determine the state of copy protection of content copy protected (314 ').