Even when it is small potatoes, All companies have to vigorously protect their intellectual property. With dealing with small companies, if they do not, they will lose standing in the courts for not protecting their rights. I do not agree with how they handle some of their battles, but with consummer electronics, if you do not protect your products, you can be toast. Look how Google has learn the hard way that they need as many patents as they can get their hands on to protect theirselves.
And if you will notice, the iOS on the iPhone was copied like crazy for Android and WebOS. Whatever else might be said about it, Windows 8 is about the only OS that is not a copy of Apple.