I want to know the answer to the following question:
Which competitor sued Apple over rights to part of the software user interface?
All the background I'm provided with is that "Apple's application to the United States Patent and Trademark Office for a patent on "rotational user inputs", as used on the iPod interface, received a third "non-final rejection" (NFR) in August 2005.". Is that enough to answer the question?
Answer: no