Patent ID: 7555650
Filing Date: 2009-06-30
Classification: H04N

Abstract:
1. A method for use in a watermarking device comprising: making a plurality of versions of a digital representation in said watermarking device, each of the versions having a plurality of corresponding subdivisions, the subdivisions in a given version being distinguishable from the corresponding subdivisions in each of the other versions by prewatermarking the subdivisions of the given version with a digital watermark; selecting the prewatermarked subdivisions from the given version according to a selection string, the selection string having a plurality of elements, each of the elements corresponding to a different prewatermarked subdivision, and each element's value specifying the given version; and assembling a marked copy from the selected prewatermarked subdivisions of the given version according to the selection string, whereby the marked copy's watermark is the sequence of prewatermarked subdivisions of the given version.