This software is released under a Create Commons Attribution-NonCommercial license: http://creativecommons.org/licenses/by-nc/2.0/uk/

In short, this means that you're free to use it in any non-commercial setting; however if you're using it as a for-profit business, please contact me for a license.
I do not in any way plan to get rich of this software, so don't worry about any huge fees; all I want is the occasional appreciative pint of beer; I'm pretty sure that in almost all cases we can settle this for a couple of pounds, or in some cases I will even settle for a nice story on how you plan to use it :).

Actually... Contact me anyways if you're using this software.... I'd like to know that it's being used.