Appeal No. 2005-0986
Application No. 09/727,904
provides evidence that the artisan would have recognized the
benefit of utilizing a blind ciphertext decryption technique to
provide for access to digital data while, at the same time,
disclosing only the information necessary to perform the intended
transaction and protecting “challenging data” such as user
identity, specific fees, or purchase price (pointing to column
11, lines 25-65, and column 12, lines 10-18, of Kyojima) (answer-
page 4).
The examiner then concludes that it would have been obvious
to modify the method of Nishioka to include the blind decryption
technique “because it would provide further privacy to a user
purchasing an information item since the content of the delegated
encrypted key and the decryption key of the digital data cannot
be known to the proving device, as per teachings of Kyojima.”
The examiner points to column 2, lines 2-4, of Kyojima for the
motivation of providing for the privacy of a recipient of data,
and to column 2, lines 15-25, for a teaching of the seriousness
of the privacy problem being exacerbated when decryption of data
is occurring over a network.
Appellants’ view is that the instant claimed invention would
not have been obvious, within the meaning of 35 U.S.C. § 103,
because neither of the applied references teaches the advantage
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