[Auth]United States Patent: 6,421,768

[david nicol]

http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=/netahtml/srchnum.htm&r=1&f=G&l=50&s1='6421768'.WKU.&OS=PN/6421768&RS=PN/6421768

It appears to be heavily into crypto.  Would it be worthwhile
to try to apply for a patent for AIS?  AIS seems obvious -- as does
Pupura's invention, but only after designing something else that
does the same thing.  The verbiage about what exactly "single sign on"
is is very good and worth looking at.  I'm not sure how to get a shorter
URL out of a patent office search though