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Authorize software will allow artists to list thier material in a web based BluFilter database and set prices. Then P2P network facilitators such as Kazaa, Morpheus etc. can plug in the BluFilter ActiveX component into thier applications for free. Here is how it will work. When a user or file sharer completes the download of a song, the BluFilter component extracts a digital signature of that file and cross references it with the content database to check for copyright validity. If the file is copyrighted, the user can opt to purchase it for the preset price otherwise the file is deleted. While the majority of the transaction revenue goes directly to the artist or record company, a percentage will also go to the file-sharing network.