This goes back to the 80's, or possibly even 70's and deals with how computers work on a fundamental level. As you know, copyright means that the rights holder is the only one allowed to authorize copies. When a program runs, it is copied from the storage medium (i.e., disk, but back then it was tape) and into RAM. That's a copy. Copyright law was modified to explicitly permit these types of copies (I believe they are termed "transient copies") for license holders.
Apple's argument goes back to this statute. Apple's license says that you can only run Mac OS X on Apple hardware. Thus, the copy from disk to RAM on non-Apple hardware is an unauthorized copy.
It makes sense, from a letter-of-the-law point of view, and I find it very interesting because by and large nobody thinks about software copying in that sense anymore, but back in the day it was a very hot issue. I'm not saying I endorse this argument, but IIRC, this is how the law is written. Also, IANAL, so if you want to know more about this, go look it up yourself.
Ever hear of HINFO or TXT records?
What really concerns me is that now we've got Klingons attacking Earth establishments and we have no sign of Romulans. I fear that Enterprise was right all along.
I thought the story was going to say they like American Idol.
To be is to program.