Copy-protection device for data carriers e.g. digital music cassettes, CDs, DVDs, has coding applied to data carrier for reading by sensor

摘要

Copy-protection device for data carriers (10) has the coding formed by a transponder (16) and the code-reading sensor (28) is a transmission-and-receiving unit communicating with the transponder. More specifically the transponder (16) has at least one semiconductor component with an integrated circuit, the latter being electrically- or laser-programmable