Processing copy protection signals
A method and device if or recording an information signal with first copy protection information to a storage medium includes recording according to first copy rules identified by the first copy protection information. The first copy protection information identifying the first copy rules is detected, and at least second copy protection information is recorded according to the detected first copy rules. The first and second copy protection information identify a legality message to be interpreted by reader. Screening information is recorded in a safe way on the storage medium to identify that the first copy protection message has been read.
1. A method of recording an information signal with first copy protection information to a storage medium using recording means, said recording being performed according to first copy rules identified by said first copy protection information, said method comprising the acts of:
detecting said first copy protection information identifying said first copy rules,
recording at least second copy protection information according to said detected first copy rules, said first and at least second copy protection information identifying a legality message to be interpreted by reading means,
recording screening information in a safe way on said storage medium, said screening information identifying that the first copy protection information has been read,
wherein said screening information comprises a hash of at least a part of said information signal.
2. The method according to claim 1 , wherein said second copy protection information is recorded in combination with third copy protection information according to said detected first copy rules, said combination of second and third copy protection information together with said first copy protection information identifying said legality message to be interpreted by said reading means.
3. The method according to claim 2 , wherein the first copy protection information is a first watermark and wherein the second copy information is either an encrypted information signal or an unencrypted information signal, the encryption of said information signal being performed using a first encryption process having a first predefined level of security and wherein the third copy information is a second watermark.
4. The method according claim 3 , wherein the screening information is encrypted using a second encryption process before being stored on the storage medium.
5. The method according to claim 4 , wherein the second encryption process has a level of security at least equaling the first predefined level of security.
6. The method according to claim 1 , wherein the screening information is being stored on said storage medium in a safe channel where only the recording means can record data.
7. The method according to claim 1 , wherein said screening information is stored in a watermark being added to the information signal before recording the information signal to the recording medium.
8. The method according to claim 7 , wherein the watermark storing the screening information is fragile.
9. A device for recording an information signal with first copy protection information to a storage medium using recording means, said recording being performed according to first copy rules identified by said first copy protection information, said arrangement comprising:
means for detecting said first copy protection information identifying said first copy rules,
means for recording at least second copy protection information according to said detected first copy rules, said first and at least second copy protection information identifying a legality message to be interpreted by reading means,
means for recording screening information in a safe way on said storage medium, said screening information identifying that the first copy protection information has been read, wherein said screening information comprises a hash of at least a part of said information signal.