MEMORANDUM AND ORDER
BREYER, District Judge.
This is a lawsuit for infringement of United States Patent No. 4,593,353 (the '353) issued on June 3, 1986. The '353 describes an apparatus for protecting against the unauthorized use of computer software. Plaintiff accuses defendants' "keys," also known as "dongles," marketed under the brand name "Sentinel," of infringing the '353. Now before the Court are the parties' cross-motions for summary judgment.
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