If Microsoft had said that, wouldn't it be mentioned on the Mono-concerns
page? --> http://www.mono-project.com/MonoConcerns

Or were you referring to Monos claims that it only implements code that is
covered by Microsofts community promise (discussed on the Mono licensing
page)? --> http://www.microsoft.com/interop/cp/default.mspx

I'm just curious and trying to understand the issue a little better...

I also thought mp3s were only an issue if you sell them or build and
distribute a decoder...