More about Lightbend's Akka and BUSL

notes.md

@@ -32,6 +32,33 @@ need followup.
 
 * Akka (BUSL) [license FAQ](https://www.lightbend.com/akka/license-faq)
 
+  They moved to BSL last year; after 3 years, code switches from BSL
+  to Apache 2.0.  From [their blog
+  post](https://www.lightbend.com/blog/why-we-are-changing-the-license-for-akka):
+
+    > ...
+    > The new license for Akka is the Business Source License (BSL)
+    > v1.1, with an additional usage grant to cover some open source
+    > usage of Akka, such as part of the Play Framework. The BSL was
+    > created by David Axmark and Michael Widenius and has been
+    > adopted by MariaDB, Cockroach Labs, Sentry, Materialized, and
+    > others.
+    > 
+    > The BSL is a “Source Available” license that freely allows using
+    > the code for development and other non-production work such as
+    > testing. Production use of the software requires a commercial
+    > license from Lightbend. The commercial license will be available
+    > at no charge for early-stage companies (less than US $25 million
+    > in annual revenue). By enabling early-stage companies to use
+    > Akka in production for free, we hope to continue to foster the
+    > innovation synonymous with the startup adoption of Akka.
+    > 
+    > After 3 years, the BSL license indefinitely reverts to an Apache
+    > 2.0 license. A [detailed FAQ](http://lightbend.com/akka/license-faq) is available to answer many of the
+    > questions that you will have about the license change. You can
+    > see our version of the BSL [here](https://lightbend.com/akka/license).
+    > ...
+
 * [Atom (text editor)](https://atom-editor.cc/blog/2014/05/06/atom-is-now-open-source/)
 
   (suggested by @Zaeraxa in reply to https://news.ycombinator.com/item?id=37745772)