BSD-license-compatible, and NO_STACK build variants

README.md

@@ -54,4 +54,10 @@ Bindings for various [languages](examples)
 ***
 
 ### Testing and Debugging
- - See [TESTING.md](TESTING.md)
+ - See [TESTING.md](TESTING.md)
+
+### Licensing
+ - For a [BSD]() license, build using the `lwIP` network stack with `STACK_LWIP=1`
+ - For a [GPL]() license, build using the `picoTCP` network stack with `STACK_PICO=1`
+
+ Regardless of which network stack you build with, the socket API will remain the same.