This plug-in currently has only one goal, namely to proguard:liberate a jar from certain of its dependencies, using the ProGuard utility[1].

To use it, edit the pom.xml of the Maven project whose artifact is the jar to be liberated, according to the version of Maven you're using - 2.0 or 2.1.

[1] There is an existing Maven ProGuard plug-in, but this does not have an equivalent goal.