Method for image processing to facilitate copy protection

Details Method for image processing to facilitate copy protection Method for image processing to facilitate copy protection

H - Electricity

04

L

H04L 9/32 (2006.01) G06T 1/00 (2006.01)

Patent

CA 2304041

A method for mapping a work (e.g., a picture, a document or the like) comprising a large number of bytes into a relatively small bit string to facilitate copy protection. The technique creates a first string from the work with the property that if one modifies the work by some given degree (e.g., through intentional variation or perhaps merely through aging), a second string (generated by the inventive technique) and associated with the modified work is not meaningfully distinct from the first string. When applied through the algorithm, works that are similar result in the same or similar strings. As a result, an owner of the content sought to be protected may apply the algorithm to copies of the work for copy protection purposes.

Procédé permettant d'effectuer le mappage d'une oeuvre (graphique, document, etc.) constituée d'un grand nombre d'octets de façon à obtenir une chaîne binaire relativement petite afin de faciliter la protection contre la copie. La technique consiste à créer, à partir de l'oeuvre, une première chaîne caractérisée par le fait que si quelqu'un modifie ladite oeuvre à un certain degré (modification intentionnelle ou simple vieillissement), une seconde chaîne (générée par la technique de l'invention) associée à l'oeuvre modifiée n'est pas sensiblement distincte de la première chaîne. Une fois que l'algorithme leur a été appliqué, des oeuvres similaires donnent des chaînes identiques ou similaires. Le propriétaire du contenu à protéger peut donc appliquer cet algorithme aux copies de l'oeuvre à des fins de protection contre la copie.

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