I may "descriptively reference" trademarks, proper names, locations and characters from products listed in Section 1 of the Community Use Approved Product List. What do you mean by "descriptively reference"?
In general, this means you may create and publish original works using those things in a variety of ways. You can write original fiction or adventures using them, you can create original artwork illustrating them, you can write up entries in a wiki about them, and more. (You may not, however, simply republish significant sections of descriptive text from our products—you need to craft new text.)
Does this mean I can write my own adventures for the Pathfinder RPG, set them in Golarion, put characters like Seoni and Valeros in them, put a Pathfinder logo on the cover, and distribute them via my website?
Yes, so long as you don't charge anything for them, and you follow all the other rules.
You say that I "may not alter the color, typography, design, or proportions of the logos or icons, or otherwise modify them." Can I resize them?
Yes, you can resize them, so long as you resize them proportionally—that is, you don't squish them by scaling them more in one direction than in another. This also applies to product covers and other images.
Open Game Content from our products is covered by the Open Game License (OGL), published by Wizards of the Coast. Use of this content must follow the OGL guidelines, and falls outside the scope of the Community Use Policy.
I want to use the OGL in addition to the Community Use Policy. Section 7 of the OGL says "You agree not to indicate 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." Does the Community Use Policy count as "another, independent agreement" for this purpose?
Yes—the Community Use Policy allows you to indicate compatibility or co-adaptability with trademarks from products listed in Section 1 of our Community Use Approved Product List.
Do the Community Use Policy and the Pathfinder Roleplaying Game Compatibility License do the same thing? Which should I use?
They each do very different things. The Pathfinder Roleplaying Game Compatibility License allows commercial and non-commercial users to use a special logo that indicates compatibility with the Pathfinder Roleplaying Game—and that's the only thing it allows. The Community Use Policy allows non-commercial users to use a bunch of different Paizo-owned materials, as outlined above. If you're a commercial publisher, you may only use the Pathfinder Roleplaying Game Compatibility License. If you're a non-commercial user, you may use either or both, depending on what you're doing.
I'm writing my own adventure that's compatible with the Pathfinder RPG. Should I use the Pathfinder Roleplaying Game logo from the Community Use Package, or the Pathfinder Roleplaying Game Compatibility Logo using the Compatibility License?
If you're a professional publisher, you may only use the Pathfinder Roleplaying Game Compatibility License and Logo. If you're a non-commercial user, the choice is yours!