Thank you for pointing out the thread you were talking about.
It’s unlocked now.
Regarding your copyright topic, please see our trademark policy here:
Please make sure that users can see by the Apps title that this is not an official Zammad App but from a third party. Something like this should be enough:
https://play.google.com/store/apps/details?id=com.trulysystems.zammadapp&hl=en_US&gl=US