Is there any reason Dexguard is not available on any public maven repo? Maven Central, JCenter or even anything hosted directly by Guardsquare would work. So far I have seen it distributed only as a zipped bunch of jars. Why?
Updating the answer: As of version 8.5, DexGuard is accessible via secure Maven repository.
Please see the page Integration / Gradle plugin / Maven repository in the manual for more information.