If you would like to use this product, licensing fees are $20 per website which it is used on. This product comes with no warranties or guaranties, but it is what I am using for all forms on this site, and you may experiment with it as much as you would like prior to purchasing it.
If you would like to see about bulk purchasing licenses for a discount, please contact me. You may use the source code as you wish, as long as any modified distribution is paid for. While I wish that this was something that I could make free, I do need an income. The paypal form is the only form on this site that does not use this product to be created, as the code is provided by paypal.