Patent ID: RE40919

Claim:
A method for surveying distribution of proprietary empirical data sets, such as audio, image, or video data, on computer sites accessible via the internet, comprising: automatically downloading data, including empirical data sets, from a plurality of computer sites over the internet; for each of a plurality of empirical data sets obtained by said downloading operation, automatically screening same to identify the potential presence of identification data steganographically encoded therein; for each of a plurality of empirical data sets screened by said screening operation, discerning identification data, if any, steganographically encoded therein; and generating a report identifying steganographically encoded empirical data sets identified by the foregoing steps, and the site from which each was downloaded; wherein there is calibration data steganographically encoded within at least one empirical data set, said calibration data having one or more known properties facilitating identification thereof during the discerning step; the method including identifying the calibration data within the empirical data set and using data obtained thereby to aid in discerning the identification data from the empirical data set; wherein the empirical data set has been corrupted since being encoded, said corruption including a process selected from the group consisting of: misregistration and scaling of the empirical data set; the method further including using said data to compensate for said corruption, wherein the identification data can nonetheless be recovered from the empirical data set notwithstanding said corruption.