Commercial license - No limitations on use.
Indie license - Indie licenses can only be licensed by individuals or companies with less than $100,000 U.S. in annual revenues. Being "indies" ourselves, we are sympathetic to your needs!
Indie promotion: If you can't afford the $50 but want to (favorably!) review or discuss Decoda publicly, send it to us and we can give you a complimentary license in return.
You can also license the source code or buy a site license - just write us for details.