One notable irony of Apple's fortress-of-patents strategy is that the company's own signature innovation was quite possibly based on theft. That's the graphical display feature of its pioneering Macintosh computer. The originator of the graphical display was Xerox Corp.'s Palo Alto Research Center, or PARC, which in 1979 gave Apple co-founder Steve Jobs and the design team of Apple's Lisa computer, the Mac's precursor, a super-secret demonstration of the technology.
Dazzled by the screen display he saw at PARC, Jobs ordered the designers to put something just like it into the Lisa, and subsequently the Mac. That didn't stop Jobs from suing Microsoft in 1988 for allegedly poaching the Mac interface to create Windows. But it did elicit this classic comeback from Bill Gates, published in a trade magazine in 1989: "Steve, just because you broke into Xerox's house before I did and took the TV doesn't mean I can't go in later and take the stereo."
Plainly, if software had been judged patentable in 1979 and Xerox had taken the aggressive approach common today, it could have blasted Apple into the asteroid belt. Jobs wouldn't be a lionized figure today, but a tech industry footnote.