The license is for a multi-user, developer version of the software. It is a site license. The fact that it is a "developer" version means that it is unlocked, so that your organization can make any modifications to it that you want. That it is a multi-user site license means that it may be shared by as many people as your organization needs at one location, either by placing it on a server or sharing it between computers using a peer-to-peer system. You may integrate this product into your own solution and deploy that solution at a single site. There are no per-seat restrictions at that site. If you wish to distribute CC NonProfit integrated within your solution to more than 1 site, you would need to buy additional licenses.
We encourage our customers to use CC Products as a foundation for their own custom needs. However, users are enjoined from reselling, lending, or distributing any portion of these templates in any form other than as a thoroughly modified, tightly integrated component of another solution of their own design. That is, users may not resell or distribute CC Products (or derivative works based upon them) as templates or in such a way that they would compete with CC Products.