| 摘要 |
A method and arrangement are disclosed for distributing multimedia content such that that the actual distribution of said content can be monitored in an efficient and reliable manner. The invention combines the extensiveness of feature extraction and the robustness of watermarking. Characteristic features of the content, e.g. luminance distribution, are extracted ( 11 ) to constitute a signature (SIG) of the content. In addition, a watermark is embedded ( 12 ) having a payload representing an index (ID) in a database ( 10 ) in which the content to be monitored is stored. The watermark serves as an index for limiting the database search needed for monitoring the signatures.
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