The package contains software from a variety of sources.
src/com.cowlark.eventbus: this is a heavily hacked version of GWT's event bus mechanism. This is Apache 2.0 licensed.
src/com.cowlark*: was previously written by David Given and is MIT licensed.
lib/retroweaver*: retroweaver is covered by the BSD license.
lib/asm*: ASM is covered by the BSD license.
The full text of all these licenses are enclosed in the licences folder.