Copy protection via multiple tests | Patent Publication Number 20020136427

US 20020136427 A1
Patent NumberUS 07123739 B2
Application Number9969004
Filled DateOct 2, 2001
Priority DateFeb 26, 2001
Publication DateSep 26, 2002
Original AssigneeKoninklijke Philips N.v.
Current AssigneeGamehancement Llc
Inventor/ApplicantsMichael Epstein
Antonius A. M. Staring
Michael Epstein
Antonius A.M. Staring
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