Patent ID: 7899205
Filing Date: 2011-03-01
Classification: G06T,G11B,H04N

Abstract:
1. A method of detecting a version of data content which is input to a version detecting device having a processor, there being a plurality of different versions of said data content, each version being partitioned into two or more segments according to a segmentation time division pattern which is common to all versions of the data content and each version of the data content being identifiable by an identification data pattern, the identification data pattern being formed when the data content is generated by selecting a version of each segment from a set of n versions of said segment, where n is 2 or more, each version of said segment having different respective identification data, and the sequence of selection used for each different version of the data content forming a respective different identification data pattern, said method comprising: detecting, using the version detecting device, respective identification data in a respective period of data content corresponding to each of the two or more segments of said data content; comparing, using the version detecting device, said detected identification data with said identification data patterns corresponding to said different versions of said data content; detecting, using the version detecting device, any matches obtained between said detected identification data and said identification data patterns in a period of data content of a segment; calculating, using the version detecting device, a threshold number in dependence upon how many matches are detected per segment for the two or more segments of said data content; and detecting, using the version detecting device, that said data content comprises at least a contribution from a certain version of said data content when a total sum of matches obtained between said detected identification data and said identification data pattern for said certain version exceeds said threshold number.