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ContentGuard OASIS RL TC Intellectual Property Disclosure May 21, 2002.
At this time ContentGuard believes its US Patents 5,638,443, 5,634,012, 5,715,403, and 5,629,980 have claims that may necessarily be infringed by the use of a rights expression language, such as the rights expression language being promulgated by the RL TC, to implement digital rights management technologies.
ContentGuard agrees to offer a license, on reasonable and nondiscriminatory terms, to use any patent claim of US Patents 5,638,443, 5,634,012, 5,715,403, and 5,629,980 which are necessarily infringed by the use of the rights expression language being promulgated by the RL TC.
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