Dean786 and daffy4226,
Both s1res and s1fwx are both FREE to use can be downloaded from:
http://www.s1mp3.de/
In the main page, the very first paragraph states:
"All development tools found on this page are public domain and free to use..."
You can also download it from our website as well.
Hope that helps.
If you want to know how to use it, have a look at the [Knowledge Base] section within our site (on the left hand side menu bar).