Copyright Management and Control Systems: Post-Infringement Post-infringement technologies allow the owners of copyrighted works to identify infringements and thus enhance enforcement of intellectual property rights and encompass systems such as: 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 copyright management information. 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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Basics: Limitations Temporal Copyright protection is limited in time. Many countries have adopted a term of protection that starts at the time of the creation of the work and ends 50 years (in some cases 70 years) after the death of the author. Under some national laws exist exceptions either for certain kinds of creations or for certain uses. After the protection has expired works pass into the public domain. In recent years a tendency towards the lengthening of the term of protection has emerged. Geographic The owner of a copyrighted work is protected against acts restricted by copyright under the law of a certain country. To gain protection against such acts in other countries he must refer to the respective national legislation. If both countries are members of one of the international conventions on copyright, the practical problems arising from this geographical limitation are eased. Non-Material Works In some countries works that are not fixed in some material form are excluded from copyright protection. Also under certain national legislations, the texts of laws and decisions of courts and administrative bodies cannot be copyrighted (which is possible in several countries; then the government is the owner of the copyright in such works and can exercise his rights in accordance with the public interest).

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Moral rights Authors of copyrighted works (besides economic rights) enjoy moral rights on the basis of which they have the right to claim their authorship and require that their names be indicated on the copies of the work and in connection with other uses thereof. Moral rights are generally inalienable and remain with the creator even after he has transferred his economic rights, although the author may waive their exercise.

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