extended MIT license

A popular choice is the Duel license BOTH GPL AND (non-modified) MIT. The non-modified MIT license is on the list of Compatible licenses though (See:Expat License)

Area of jurisdiction: Austria.

This is interesting to me, I’m not sure that line violates any license but to me part of Open Source is just giving up some rights.

and every other copyright notice found in this software, and all the
attributions in every file,

Copyright in the source code is protected however, requiring public copyright notices violates both licenses.

The Software may be used to publish and/or display legal content.

This is implied with the MIT/GPL as you aren’t limited in what you can do with the software so there should be no need to state that they can use it for legal content