@ Neil H : USB VID/PID
All licensed USB manufacturers are allocated a VID and a VID/PID pair forms a unique identifier of a particular USB-based product. That VID is paid for and licensed solely to the owner of that VID. VID = Vendor ID, PID = Product ID.
Palm breached the USB license they had agreed to and used Apple's VID/PID to fake it so iTunes thought their product was an iSomething, akin to cloning a key and opening their front door.
Apple used other techniques to detect Palm's key was cloned, not a legitimate one, and rejected access using their cloned key. Hence Palm were locked out. They went crying to the USB IF, but, as using someone else's VID is not allowed, the USB IF ruled against Palm. Quite rightly so.
Whether Apple, or anyone else, should be allowed to lock their software to certain products is a matter for debate, but not something the USB IF could ever rule on. Palm applied to 'the wrong court' in the hope of getting a judgement in their favour. That was never going to be and pretty stupid as it seemed clear to everyone but Palm they would lose.