A system and method for enforcing rights expressions specifying manners of use of an item, include specifying by a potential recipient of an item a first rights expression indicating a first manner of use of the item proposed by the recipient; specifying by a provider of the item a second rights expression...http://www.google.fr/patents/US7206765?utm_source=gb-gplus-shareBrevet US7206765 - System and method for supplying and managing usage rights based on rules
System and method for supplying and managing usage rights based on rules
