Foil is free, but not public domain. I retain all rights. It may be distributed freely, but may not be sold. Foil may be included on disk that are sold for a small charge to cover costs, but only with express written permission from the author.
Disclaimer of Warranty on Foil.
You expressly acknowledge and agree that use of Foil is at your sole risk. Foil and related documentation are provided "AS IS" and without warranty or technical support of any kind and the author expressly disclaims all warranties, express or implied, including, but not limited to, the implied warranties of merchantability and fitness for a particular purpose. The author does not warrant that the functions contained in this software will meet your requirements, or that operation of the software will be uninterrupted or error-free, or that defects in the software will be corrected. Furthermore, the author does not warrant or make any representations regarding the use or the results of the use of the software or related documentation in terms of their correctness, accuracy, reliability, or otherwise. No oral or written information or advice given by the author shall create a warranty or in any way increase the scope of this warranty.
Limitation of Liability. Under no circumstances including negligence, shall the author be liable for any incidental, special, or consequential damages that result from the use or inability to use the software or related documentation, even if the author has been advised of the possibility of such damages.
In other words, it’s free, don't sell it, use at your own risk and I’m not responsible for nothing.