It starts getting annoying! Another illegal copy of Periodical shows up again, this time with the name “Periodical calendar” from someone called “Eminantapps”. Currently available at https://play.google.com/store/apps/details?id=eminantapps.infotech.periodical_calander:
This is now the fourth case of this kind I am aware of. It’s just so easy to use existing sources and build your own app that contains advertising.
I can not really top this happening – but I report every single case to Google and also write to the creators of these apps to delete them immediately.
As a reminder: Periodical is not public domain but has been released under the GPL! The GPL is legally binding and requires that the author of the work on which the app is based is named and that the sources of the modified version are available.