Assignee
SPECTRADISC CORP
US5 patents
Top patents by PatentIndex Score
US6338933B1Jan 15, 2002
Methods and apparatus for rendering an optically encoded medium unreadable
SPECTRADISC CORP181 citations98
US6434109B2Aug 13, 2002
Machine-readable optical disc with reading-inhibit agent
SPECTRADISC CORP109 citations96
US6011772AJan 4, 2000
Machine-readable optical disc with reading-inhibit agent
SPECTRADISC CORP253 citations96
US6343063B1Jan 29, 2002
Machine-readable optical disc with reading-inhibit agent
SPECTRADISC CORP78 citations94
US6531262B1Mar 11, 2003
Methods and apparatus for rendering an optically encoded medium unreadable and tamper-resistant
SPECTRADISC CORP35 citations91