A method of and device (110) for granting access to content on a storage medium (101), comprising obtaining cryptographic data (Y) from a property (102), such as a wobble, of the storage medium (101), reading helper data (W) from the storage medium (101), and granting the access based on an application...http://www.google.de/patents/US7568113?utm_source=gb-gplus-sharePatent US7568113 - Reliable storage medium access control method and device
