Motorola contributed some patents to a mobile telecom standard; they made a commitment to license these standard essential patents in Fair, Reasonable And Non-Discriminatory terms to everyone who wants to build a "portable hand-held telephone device".
Motorola wants 2.25% of the sale price of each Apple device in which the standard is used.
Now, if each patent contributor to the standard demands the same rate as Motorola, the outgo will be above 100%.
Essentially, only those who have contributed to the patent pool can build a mobile phone. No one else can enter the market. How is that Fair, Reasonable or Non-Discriminatory?
That is why there is talk about EU & FTC in US investigating Google/Motorola for anti-competitive behavior.
Also, there is another interesting point here - all these patents are implemented in the baseband chip built by Qualcomm and used by Apple in its devices. Qualcomm has already paid the royalty for using Google/Motorola's patents. Now Motorola wants royalty from Apple also, for the same patents. Double-dipping anyone?