http://www.freedom-to-tinker.com/doc/2004/bnetd_30sep.pdf
From my reading, the judge is claiming that because the bnetd authors didn't have permission to reverse engineer the Battle.Net protocol, they breached copyright by reverse engineering it. Apparently in the USA you can waive your legal rights through clickwrap licensing, and part of the EULA for various Blizzard games and Terms of Use for Battle.Net included language that forbade reverse engineering the network protocol.
Alex
"If knowledge can create problems, it is not through ignorance that we can solve them." --Isaac Asimov
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