A multi-layered copy protection scheme distinguishes between security
failures due to faulty watermark detection schemes and true security
failures. At an initial security level, the fault-tolerance is low. If
the security test fails at this initial security level, the process
enters a next level of security, wherein the fault-tolerance is
increased, but at the expense of additional processing time. If the
security test again fails at this increased security level, the process
enters a higher level of security, wherein the fault-tolerance is further
increased, but at the further expense of additional processing time.
Eventually, either the security test is passed, and the protected
material is rendered, or a determination is made that the failures are
not due to faults in the watermark detection process, indicating that the
content material is, in fact, copy protected, but not authorized for
rendering.