METHOD AND APPARATUS FOR RECORDING SECONDARY INFORMATION ON A RECORD CARRIER

摘要

The present invention relates to a method of recording secondary information on a record carrier, in particular on an optical record carrier, besides its content information, whereby it is possible to differentiate the record carrier from other record carrier bearing the same content information, for example by recording an individual identifier. The secondary information is recorded by: forming at predetermined positions dummy patterns (23), preferably at the same moment as when recording the content information, and recording the secondary information by selectively modifying the dummy patterns, thereby obtaining modified dummy patterns (24), wherein the dummy patterns as well as the modified dummy patterns correspond to valid channel words. The invention further relates to an apparatus for recording secondary information, to a record carrier, and to a method and to an apparatus for reproducing the secondary information.