Appeal No. 2000-1308
Application 08/550,909
More particularly, the invention is directed to encryption and
decryption techniques which help eliminate the pirating of the
protected material by unauthorized users.
Representative claim 18 is reproduced as follows:
18. For an encryption system which includes sub-systems
which (1) communicate with each other using communication
channels, and (2) cooperate to deliver to subscribers encrypted
material and encrypted keys, a method comprising the following
steps:
a) when the encrypted keys are stored in a sub-system,
storing them in encrypted form; and
b) prior to transferring a stored encryption key from one
sub-system to another,
i) de-crypting the stored key into plain text,
ii) encrypting the plain text into cypher text, and
iii) transferring the cypher text to the other system.
The examiner relies on the following references:
Rivest et al. (Rivest) 4,405,829 Sep. 20, 1983
Mason 4,736,422 Apr. 05, 1988
Inoue 5,195,134 Mar. 16, 1993
Pires 5,204,900 Apr. 20, 1993
Rager et al. (Rager) 5,363,447 Nov. 08, 1994
Finkelstein et al. 5,410,602 Apr. 25, 1995
(Finkelstein)
The following rejections are on appeal before us:
1. Claims 18-22 and 25-29 stand rejected under 35 U.S.C.
§ 112, first paragraph, as being based on an insufficient
disclosure.
2
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