They're now charging $0.75 per software mp3 decoder...Even if you give it away.
If you aren't using any of their code, the only way they can charge you is for use of their patents. Software patents are explicitly ruled out in the EU by the
Munich Convention, which is implemented in the UK by the
Copyrights Designs And Patents Act. Software patents are, however, legitimate in the USA. If you are in the USA and feel strongly about this arbitrary imposition upon you, write to your congressman. You may wish to ask (a) for software patents to be declared illegal (b) for their term to be reduced and/or (c) for exemptions for the use of patents for non-profitmaking activities. Or whatever. You are after all We The People.
Peter