Recently release Warcraft III Reforged's EULA includes this passage:
- Ownership Custom Games are and shall remain the sole and exclusive property of Blizzard. Without limiting the foregoing, you hereby assign to Blizzard all of your rights, title, and interest in and to all Custom Games, including but not limited to any copyrights in the content of any Custom Games. If for any reason you are prevented or restricted from assigning any rights in the Custom Games to Blizzard, you grant to Blizzard an exclusive, perpetual, worldwide, unconditional, royalty free, irrevocable license enabling Blizzard to fully exploit the Custom Games (or any component thereof) for any purpose and in any manner whatsoever.
"Custom games" refers to maps created in their map editor, with all the geography, design, special code to handle custom logic, potential custom graphics and sound assets. I'm also told that StarCraft II map editor's EULA is mostly similar.
This, apparently, is their way to combat previous "DotA case", when extremely popular custom map for original WC3 evolved into entire new genre of MOBA, while Blizzard failed to recognize and acquire it and entered said genre far beyond their competition.
I'm under impression, that no EULA for a content-creating tool can bind me to give up my rights to authors of tool - after all pretty much all the electronic content ever produced is created with tools of somebody else's making - IDEs, graphics and sound editors, etc. This EULA, however, explicitly says that I "assign all of my rights", which in addition to giving Blizzard full royalty-free use, would also prevent me, the author from later remaking the map/game on another engine - be it some licensed one, or completely my own.
So, would such claims in EULA fly in court? I'm interested in USA and general EU answers.