"Jari M M Lammi" wrote ...
Say I would like to print out a commercial MP3
CD-ROM disk.

What does "print out" mean?

Are there some file format royalities to be paid, and,
would it make it impossible to release the whole thing
in the Educational Community License 1.0 which would
otherwise quarantee copyleft?

The primary concern would be the ownership/copyright
status of the material itself, regardless of what file format/
codec is stored in.

http://www.opensource.org/licenses/ecl1.php

If you said anything about the ownership/licensing of the
material itself, I must have missed it.

Or is it so that if I want to give such a permission in a
commercial product, one just would have to forget all
the MP3 hardware players and use Ogg Vorbis instead?

Hardware MP3 players use MP3 decoder chips which include
the MP3 royalties as part of the cost the manufacturer paid for
the chip. Software that encodes into MP3 legally should use
licensed/paid-for algorithms/dlls/etc. For example Adobe
Audition includes this statement in the control panel for MP3
encoding...

"mp3PRO audio coding technology licensed from Coding
Technologies, Fraunhofer IIS and Thomson multimedia."

Dunno about the freeware MP3 encoders/players ??

My guess would be that simply publishing MP3 files which
were already encoded by somebody else would not be subject
to any further MP3 licensing, etc. ASSUMING that you own
the right to distribute the encoded program material content.
Also assuming that posting to a website, etc. is what you meant
by "print out"??