Since the script code for a JavaScript calculator resides in the source code of the html page it's installed on, the script can be easily copied (stolen). This is why most calculator companies don't offer them and instead choose to create and sell the more costly server-side calculators -- the code for which cannot be copied (stolen).We at Web Winder believe Javascript calculators are the most inexpensive and user friendly calculator formats available, and have therefore elected to trust you to license any calculators you copy from our site.
Sure, there are those that will ingore our copyright and steal the calculators anyway, but since Integrity is a large part of the key to success in business, these thiefs are not around for very long anyway -- especially if we catch them. ;-)