Patent US 6,757,828  June 29, 2004
Patent Japan 4,447,219 January 29, 2010
Indigenous Authentication for sensor-recorders
and other information capture devices.

6757828-signa2.pdf
Full document  33 pages  1.5 MB PDF

6757828-pg1.pdf
First page only  45 KB PDF

Signa2-Brief-v2b.pdf
Briefing document  13 pages  346 KB PDF

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