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    Copyright Management and Control Systems: Post-Infringement Steganography Applied to electronic files, steganography refers to the process of hiding information in files that can not be easily detected by users. Steganography can be used by intellectual property owners in a variety of ways. One is to insert into the file a "digital watermark" which can be used to prove that an infringing file was the creation of the copyright holder and not the pirate. Other possibilities are to encode a unique serial number into each authorized copy or file, enabling the owner to trace infringing copies to a particular source, or to store Agents Agents are programs that can implement specified commands automatically. Copyright owners can use agents to search the public spaces of the Internet to find infringing copies. Although the technology is not yet very well developed full-text search engines allow similar uses. Copyright Litigation While not every infringement will be the subject of litigation, the threat of litigation helps keep large pirate operations in check. It helps copyright owners obtain relief for specific acts of infringement and publicly warns others of the dangers of infringement.  | 
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              User tracking User tracking is a generic term that covers all the techniques of monitoring the movements of a user on a web site. User tracking has become an essential component in online commerce, where no personal contact to customers is established, leaving companies with the predicament of not knowing who they are talking to. Some companies, such as Whenever user tracking is performed without the explicit agreement of the user, or without laying open which data are collected and what is done with them, considerable  | 
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