Importance

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Abstract

A method of identifying and verifying the content of multimedia documents accessible in a distributed system having multiple entry points, the method comprises: a) a step of registering multimedia documents as identified works, the registration step comprising, for each multimedia document under consideration, extracting a digital fingerprint comprising an ordered sequence of signatures in cascade resulting from multi-criterion analysis and breaking down into component parts of the multimedia document under consideration; and b) a step of verifying whether a given multimedia document accessible to the public constitutes authorized or unauthorized use of a registered work, the verification step comprising making successive comparisons using the signatures in cascade of the registered multimedia documents with the corresponding signatures of the given multimedia document, each following comparison being performed only if the previously compared signatures have revealed similarities, each comparison of signatures in cascade being performed only on signatures in a group of registered multimedia documents whose previously-compared signatures have revealed similarities with the signatures of the given multimedia document, the final result of the last comparison enabling a report to be drawn up containing the list of registered multimedia documents that have shown similarities with the given multimedia document as input.

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First Claim