Patent ID: 7196993

Claim:
A method for producing a copy protected record carrier for digital data, comprising: determining at least one predetermined repetitive bit pattern which encodes into channel bits having an accumulated digital sum value that exceeds a first predetermined limit and that is below a second predetermined limit; replacing at least one part of the digital data to be recorded by the at least one predetermined repetitive bit pattern and/or inserting the at least one predetermined repetitive bit pattern into at least one part of the digital data to be recorded; and transferring the digital data, including the at least one replaced and/or inserted part, onto the record carrier by a mastering process so that the accumulated digital sum value, which exceeds the first predetermined limit and is below the second predetermined limit, is achieved in the at least one replaced and/or inserted part, wherein said predetermined repetitive bit pattern is selected so that an abnormal writing beam deviation from an ideal position of a writing beam of a record carrier recording device for recordable record carriers is large enough to ensure that a writing process will be aborted or disturbed.