Appeal 2007-0463
Application 09/896,537
of encrypted sections 104, 106, 108, 110, 112, where each section corresponds to
one of L through N levels of access (L<N), with L being the lowest level of access
(e.g., lowest resolution) and N being the highest level of access (e.g., highest
resolution) (id. at 6-7, para. 0021). That is, sections 104, 106, 108, 110, 112 are
encrypted using respective different keys 114 (K_1), 116 (K_2), 118 (K_3), 120
(K_4), and 122 (K_5), of which key K_5 represents the highest level of access.
As illustrated in Figure 2 (reproduced below), a server 200 and a client 202
create a secure authenticated channel 204 that connects a digital rights management
3
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