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Copyright protection system for photographic materials
Copyright protection system for photographic materials
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机译：摄影材料的版权保护制度
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摘要
A method of processing photosensitive materials in which one or more chemical compounds are at least partially retained after processing. The chemical compounds are unique to a particular process used by a copyright owner. The absence of the unique compounds in a processed material thus indicates that the processing has been without the authorisation of the copyright owner.
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