While the TLA doesn't give explicit permission to use any assets other than the trademark, it also includes the following:
“
In the event this Agreement terminates prior to the Commercial Launch of the FALLOUT MMOG, Bethesda agrees that nothing in this Agreement limits or is intended to limit the rights of Interplay to use in a non-FALLOUT MMOG, INTER ALIA, any or all locations, graphic representations, creatures, monsters, names, likenesses, behaviors, religions, deities, environments, legends, fairy tales, stories, universes, character classes or character professions that are in the public domain, are owned by any entity other than Bethesda and/or its affiliates and/or licensors or otherwise are not subject to copyright or trademark protection. For purposes of a non-FALLOUT MMOG, Interplay shall own all rights in any computer software code (object or source code), game play software routines, game or graphics engines, as well as any designs, likenesses, sound and visual representations or other intellectual property rights that are created after the Effective Date by or on behalf of Interplay and which do not include, refer or relate to the Licensed Marks (the "INTERPLAY-DERIVED MMOG ELEMENTS"), provided, however, that the Interplay-Derived MMOG Elements do not use, incorporate, trade on or otherwise exploit any Fallout-related intellectual property created by Interplay or by Bethesda or by their respective parents, subsidiaries, affiliates, successors or assigns, including without limitation any Fallout artwork, locations, graphic representations, story lines, creatures, monsters, names, likenesses, behaviors, environments (e.g., vaults), universes, settings, legends, characters, character classes, character professions, packaging, advertisements, text and translations, and any and all Fallout proprietary characters, trademarks, copyrights and artwork listed in Exhibit C-2 to the APA, it being understood and agreed by the parties that all such property is and shall remain exclusively owned by Bethesda.
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Why list all of these things if Interplay was supposedly not permitted to use them in the first place?