Introducing the Functional Source License: Freedom without Free-riding - eviltoast
Sentry started life in 2008 as an unlicensed, 71-line Django plugin. The next year we began publishing it under BSD-3, and ten years later…

Sentry has moved to a new license for its products called Functional Source License, and explains in this article the story of the licensing for these products and why they throw BSL for FSL.