Patent ID: 7707241
Filing Date: 2010-04-27
Classification: G06Q,H04N

Abstract:
1. A method of determining whether an encoded signal has been encoded with a particular type of encoder, the method comprising the steps of: receiving at least a part of said encoded signal; decoding the received signal using a decoder which performs the reverse operation of said particular type of encoder to generate a decoded signal; deriving a fingerprint from the decoded signal; comparing said fingerprint with one or more fingerprints stored in a database indicative of one or more particular types of encoder; concluding that the encoded signal has been encoded with said one or more particulars type of encoder if the derived fingerprint corresponds to one of the fingerprints stored in the database; wherein said steps are performed by a server which receives the encoded signal from a client through a network; and awarding the client if the server concluded that the received and decoded signal had been encoded with said one or more particular types of encoder.