Appeal No. 2002-1527 Page 23
Application No. 08/885,817
2. Anticipation Determination
As mentioned regarding claim 4, Aziz discloses that "[w]hen secure multicasting
to a multicast address M is required, a group membership creation primitive will
establish the group key Kg and the membership list of addresses that are allowed to
transmit and receive encrypted multicast datagrams to and from group address M."
Col. 14, ll. 11-17. "Nodes wishing to transmit/receive encrypted datagrams to multicast
address M," id. at ll. 23-24, must "send[] an encrypted/authenticated request-to-join
primitive to the group owner." Id. at ll. 25-26. Because the group owner exercises
discretion to authorize or deny a request to join his secure multicast, we find that the
multicast is "private." Conversely, we find that a multicast that is open for anyone to
join is public. Accordingly, the reference must determine whether a join request relates
to a public or a private multicast. Therefore, we affirm the rejection of claims 22 and 32.
Regarding claim 33, the appellants rely on their argument for claim 32. Having
found the argument unpersuasive, we affirm the rejection of claim 33.
Returning to Aziz, encrypted multicast packets used in the private multicasts
include a "destination IP address . . . used by the receiver to determine whether to use
unicast of multicast key-processing procedures on a received IP packet. In case [sic]
Page: Previous 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 Next
Last modified: November 3, 2007