Virnetx, the holder of this patent, has asserted this patent (along with U.S. patent no. 7,418,504) against Apple, Cisco, NEC and others. Of particular interest is claim 13.
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Prior Art We Are Seeking On Patent 6,502,135

May 4th, 2011

(i) systems available before December 1999; (ii) publications prior to December 1999; or (iii) U.S. Patents filed before December 1999, that disclose:

  • Early VoIP, IM or other IP-based communication systems, particularly those using SIP and/or H.323.
  • a system which establishes an encrypted communication channel (not necessarily limited to a VPN) in response to a request for a network address (not necessarily limited to a DNS request for a secure website).
  • a system for storing domai
Continued....
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All Forms of Possible Prior Art - Priority Date of October 30,1997

September 15th, 2010

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Apple, Cisco Sued by VirnetX Over Private Networks (Bloomberg BusinessWeek