Amazon released its open-source game engine, Lumberyard, for free this week. This means extensive customization for game developers, unless they're looking to use Lumberyard to run "life-critical or safety-critical systems," like medical equipment, self-driving cars, or nuclear facilities.

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That's totally against the rules, according to the company's terms of service —until the zombie apocalypse comes.Written into Amazon's clause 57.10, those restrictions won't apply "in the event of the occurrence of a widespread viral infection transmitted via bites or contact with bodily fluids that causes human corpses to reanimate and seek to consume living human flesh, blood, brain, or nerve tissue."The "fall of organized civilization," however, must be confirmed by the United States Centers for Disease Control or its successor body.Thanks for looking out, Amazon.

Nicole is a freelance writer for IGN. You can follow her on Twitter