https://bugzilla.redhat.com/show_bug.cgi?id=1410407
--- Comment #3 from Fabio Valentini decathorpe@gmail.com --- Yes.
There is no LICENSE / COPYING / COPYRIGHT file included in the official release tarball (or present in the upstream VCS). As that seems to be an "upstream oversight", I also reported this as a bug at [0].
[0]: https://bugs.launchpad.net/screenshot-tool/+bug/1654258