Right that does it...

I can't play my favourite <insert any company's proprietary format> on <insert another company's media playing device>, therefore I have been locked out, it's anti-competitive and I'm going to sue.

What a daft argument. Perhaps RealNetworks should have looked at partnering with other device manufacturers (or, gasp, built their own!) to ensure their formats could be played back. They'd have had the right to lock out Apple Lossless or AAC format files if they liked, I'm sure Apple wouldn't have sued them for trying it.

Seems to me that not supporting a competitor's format does NOT equate to an unfair business practice. If it did, MS would have been sued out of existence YEARS ago for trying to make living in a dual Mac/WinPC world much more awkward than it ever needed to be, despite Apple's best efforts to accommodate for Windows users.