Method for copy protecting a record carrier, copy protected record carrier and means for detecting access control information

The transmitting device of claim 21 wherein the means for transmitting includes means for writing the cross interleaved information containing the uncorrectable errors onto an optical record carrier, the pattern also including error words that are correct or correctable using the error correcting rules, the auxiliary information being capable of affecting the control of the operation of a record carrier reading device.

The transmitting device of claim 21 wherein the transmitted information includes an indication of the presence of the auxiliary information, and wherein the processing means encrypts the main information depending on the auxiliary information, and the transmitted signal includes padding in addition to the main information and the uncorrectable errors representing the auxiliary information are contained in the padding.

A signal in a medium comprising:

• main information that is error encoded into error words based on error correction rules, the error words being cross interleaved in the signal, and
• auxiliary information represented by a pattern including error words containing errors that are uncorrectable using the error correcting rule, the auxiliary information being capable of affecting the control of the operation of a computing device.