| 摘要 |
The invention concerns a device for copy protection of especially optical data media such as CD/DVD. By applying additional code within the redundancy area of the logical and/or physical data media format, the data media unit receives additional identifying characteristics such as watermarks. Based on the automated error correction, the additional code data are not output by the playback and display unit. A suitable verification unit can extract the code data from the random error data, which manifest itself as white noise by circumventing the error correction. Copying of the data media by illegal, professional copy devices would lead to a removal of the additional code, and would thus be clear criteria for an illegal copy.
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