Alexander Herrigel Adrian Perrig Joseph Ó Ruanaidh A Copyright Protection Environment for Digital Images. 1-16 1997 Verläßliche IT-Systeme https://doi.org/10.1007/978-3-322-86842-8_1 books/vi/97/MRRS1997 db/books/collections/MRRS1997.html#HerrigelPR97
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