More explanations about license in readme
@@ -62,6 +62,20 @@ WebAssembly
WebAssembly support is in experimental status. It may lack major features available in JavaScript backend. There's no documentation yet and you should do many things by hands (like embedding generated `wasm` file into your page, importing JavaScript objects, etc). Look at [samples/benchmark](https://github.com/konsoletyper/teavm/blob/master/samples/benchmark/) module. You should first examine `pom.xml` file to learn how to build `wasm` file from Java. Then you may want to examine `index-teavm.html` and `index-teavm.js` to learn how to embed WebAssembly into your web page.
+License
+-------
+
+TeaVM is distributed under [Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0).
+TeaVM does not rely on OpenJDK or code or other (L)GPL code.
+TeaVM has its own reimplementation of Java class library, which is either implemented from scratch or based on non-(L)GPL projects:
+
+* [Apache Harmony](https://harmony.apache.org/) (Apache 2.0)
+* [Joda-Time](https://github.com/JodaOrg/joda-time) (Apache 2.0)
+* [jzlib](https://github.com/ymnk/jzlib) (BSD style license)
+
+If you want to contribute code to implementation of Java class library, please make sure it's no based on OpenJDK or other code licensed under (L)GPL.
+
+
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