The SaaS license is intended for users that plan to develop and deploy an external application. Generally used to support the sale of a product or service, it is accessed by customers, clients, and other users outside of the licensed organization. It does not cover software products that are intended for installation and/or distribution to the customer. (The OEM license would be the appropriate fit.)
SaaS licenses are available for purchase as an annual or perpetual license. Each license is for use on a single domain. You can buy additional licenses for additional domains. Purchase of a SaaS license includes two hours of product support. Additional hours can be purchased through the Buy page. For more detailed information, see the pages for the annual SaaS license and the perpetual (one-time) SaaS license.