Licence deletion tries to delete all objects with that licence and other licences
This is the issue from launchpad I want to work on: https://bugs.launchpad.net/inkscape-web/+bug/1621607
When you attempt to delete a licence, then all objects that use that licence will be deleted, too (also in the shield).
Not sure what kind of fallback we should provide for that... All rights reserved?
Also, it will delete other licences, namely those they replace.