[RPG] Is it legal to write and distribute adventures or campaign settings for D&D 3.5

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I am considering writing and selling adventures and/or a campaign setting for Dungeons and Dragons v3.5 and I am wondering if it is legal to do so. Also what am I allowed to use from the official sources and do I need to contact Wizards of the Coast?

Best Answer

Anything you find in the SRD is Open Gaming Licence content and thus free to use so long as you abide by the terms of the OGL. You'll note that it does not contain XP or Wealth-By-Level rules, and you'll also notice that it doesn't really contain fluff; those rules (and the fluff) are still WotC's property and cannot be used. Beyond that, you're perfectly free to use any of the rules in that SRD, edit them, homebrew for them, and add your own fluff to them - in point of fact, that's how Pathfinder, World of Warcraft D20, and many other D20 systems got created and legally sold at profit. However, you are still not permitted to reference D&D in your product at that point (it's a D20 system release, but D&D itself remains the property of WotC, with whom I assume you are not affiliated).