http://www.dailytech.com/Apple+Trie...rticle17863.htm
Jonathan I. Schwartz, former CEO of Sun Microsystems, sounded off in a blog in which he recalls a similar incident in which Apple CEO Steven P. Jobs threatened to sue his company.
The event occurred back in 2003. Sun Microsystems had just unveiled "Project Looking Glass", a prototype Linux desktop with a rich 3D graphical desktop environment – Apple wasn't happy about that.
Jobs contact Schwartz, warning that the Linux project was "stepping all over Apple’s IP" and that if they put it out on the market, "I’ll just sue you."
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So Schwartz fired back at Jobs, "Steve, I was just watching your last presentation, and Keynote looks identical to Concurrence – do you own that IP? And last I checked, MacOS is now built on Unix. I think Sun has a few OS patents, too."
