1. 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.
3. Use of Third Party Content in Custom Games. You represent and warrant that neither the content you use to create or incorporate into any Custom Games, nor the compilation, arrangement or display of such content (collectively, the “User Content”), infringes or will infringe any copyright, trademark, patent, trade secret or other intellectual property right of any third party.
The EULA prohibits the use of Warcraft III or the World Editor for any commercial purpose without Blizzard's prior written consent. In addition, the EULA restricts any distribution of "New Materials on a stand-alone basis... through any and all distribution channels, including, but not limited to, retail sales and on-line electronic distribution without the express written consent of Blizzard."
Both Blizzard and Valve recognize that, at the end of the day, players just want to be able to play the games they're looking forward to, so we're happy to come to an agreement that helps both of us stay focused on that.