| 摘要 |
Conventionally, digital data comprise a passive part (2) comprising content (1) to be protected in encrypted form, an active part (3) comprising information (4) how to decrypt the content (1) comprised in the passive part (2) and a hidden part (6), wherein the active part (3) and the corresponding passive part (2) constitute an active content (8) and the hidden part (6) is allocated to the active content (8) and/or the active part (3) of the active content (8) and/or the passive part (2) of the active content (8), the hidden part (6) comprising information (7) about properties of the respective active content (8) and/or respective active part (3) and/or the respective passive part (2). <??>With said digital data it is a disadvantage that prior art solutions to provide copy protection are very uncomfortable for a user since either a central database has to be accessed or a special hardware has to be provided. <??>Therefore, it is the object to provide copy protected digital data which uses combine a high level of copy protection and a high user frankness. It is a further object to provide a method for reproducing said copy protected digital content. <??>Accordingly, the active part (2) of the active content (8) additionally comprises rules (5) to allow and/or forbid decryption of the content (1) comprised in the passive part (2) of the active content (8) based on the information (7) comprised in the hidden part (6). <??>Since neither a central database has to be accessed nor a special hardware has to be provided, the above object is solved. <IMAGE> |
