An optical disc has a security feature in the form of an RFID tag that
communicates with a voltage controlled optical modifier layer in the
optical disc. In the presence of an interrogation signal, the RFID tag
allows the optical disc to be used normally by outputting a voltage to
the optical modifier layer. In the absence of an interrogation signal,
the optical modifier layer prevents a laser from reading from or writing
on the optical disc. Other embodiments are also disclosed.