Originally Posted by drahkar
The first part is a legal concern. They don't publish content without licensing from the Publisher period. It is a matter of respect and makes sure SmiteWorks knows where they stand in regards to copyright.
Now that does not stop the community development of a ruleset for it. Something that has been discussed quite thoroughly in this thread. It just prevents them from including any content.
As to licensing, they have been working on obtaining it. To date, Paizo has simply not agreed to it yet.