@misc {IOPORT.70028540,
    author       = {Adelsbach, Andr\'e and Pfitzmann, Birgit and Sadeghi, Ahmad-Reza},
    title        = {Proving ownership of digital content},
    howpublished = {Information Hiding, 117-133 (1999).},
    year         = {1999},
    doi          = {10.1007/10719724_9},
    identifier   = {70028540},
}