"Fact: Apple obtained permission ahead of the Xerox PARC visit. In addition, Apple provided compensation in exchange for the various Xerox PARC ideas such as the GUI"
http://obamapacman.com/2010/03/myth-copyright-theft-apple-st...
Further, by bringing this up, you are trying to say that Apple copied Xerox years ago, which is a form of trying to say "its ok to copy apple or steal their technology because apple did it in the past".
Which is silly because if it was wrong for Apple to do it, as you imply, it is also wrong for HP or Samsung to do it, as you are trying to justify.
Further, when you tell a falsehood like this-- one that you really, if you're at all informed on the issue, would know is a falsehood, you impeach your own integrity.
http://en.wikipedia.org/wiki/History_of_Apple_Inc.#Xerox_PAR...
You'll notice that Xerox never filed a patent suit, that Apple's industrial design and trade dress were in fact remarkably different from Xerox's, and that the Lisa and Macintosh interfaces were remarkably different from that of the Alto in any case.
So the fact that Xerox didn't file a patent suit doesn't say much, I don't think. That doesn't mean that Xerox wasn't in the wrong or that Apple wasn't in the right; it just means that patent lawsuits really weren't the way people went about these things then.
It's probably likely that not only did Xerox not imagine that software patents were a thing, they probably didn't even imagine that you could copyright the "look and feel" of software.