Windows Kerberos PAC patent

[Fredrik Tolf]

I have to admit that I don't know a lot about Windows and Kerberos.
However, as I've understood it, the only thing that really prevents you
from using a MIT KDC for Windows clients is the authorization data they
ship in the ticket, right? And this is called "PAC", right?

I've let myself understand that Microsoft has somehow patented this PAC
field. Now, I'm wondering if anyone in this newsgroup would happen to
know what patent this is and if there's any way I can have a look at it
(mostly for curiosity reasons)?

Thanks!

Fredrik Tolf