|Vic Wertz Chief Technical Officer|
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Anything we've declared as Open Game Content in our products is available for use under the Open Game License; anything we've declared as Product Identity is unavailable. In most of our products, you'll find the statements of OGC and PI on the title or credits page at the front of the book. Note that these statements occasionally vary from product to product, so you'll need to check the individual statements in each product you wish to draw from.
To use Open Game Content in your own products, you just need to use the OGL, which you can find in any OGL product. The OGL itself tells you how to use it. Please note that the OGL is Wizards of the Coast's license, not Paizo's, and so I can't provide any advice about its suitability for your use. You may wish to consider speaking with an intellectual properties legal specialist.
I will point out that, in the OGL, "Use" means "to use, Distribute, copy, edit, format, modify, translate and otherwise create Derivative Material of Open Game Content."
Note also that the OGL specifically restricts you from using "any ... trademark or registered trademark clearly identified as Product Identity by the owner of the Product Identity", or from "indicat[ing] compatibility or co-adaptability with any Trademark or Registered Trademark in conjunction with a work containing Open Game Content except as expressly licensed in another, independent Agreement with the owner of such Trademark or Registered Trademark." So to indicate that your OGL product is compatible with the Pathfinder Roleplaying Game, you'll need to follow our free Pathfinder RPG Compatibility License, which you can find at http://paizo.com/pathfinderRPG/compatibility. Note that the Compatibility License is only applicable to books, electronic books, and freely available websites. Without the Compatibility License, you can still use Open Game Content in a OGL product that's not a book, ebook, or free website, but you can't say it's compatible with the Pathfinder RPG or use trademarks like Pathfinder or Paizo in any way. (You may, however, use the non-trademarked term "PACG" in such a work.)
If you are a noncommercial user, you may be able to use some of our PI by way of our Community Use Policy, which you can find at http://paizo.com/paizo/about/communityuse.
If you are a commercial user, our PI is not available for your use.