A system and method are disclosed for providing program criteria representing a plurality of audio and/or visual programs. A plurality of tokens are stored in a database of one or more computers, each token having an identifier for identifying a predetermined audio and/or visual program. Each token may...http://www.google.de/patents/US7673315?utm_source=gb-gplus-sharePatent US7673315 - System and method for providing program criteria representing audio and/or visual programming
