S-Cart is a free e-commerce website project for businesses. So:
you are entitled to integrate S-Cart for your own project without our permission.
using S-Cart is free..
we are exempted from all arising from the S-cart build system.
you can delete S-cart's copyright notice on the source code if you want (usually the "footer" of the project). But it is often a small donation to encourage future development.
You can support via paypal: