In June of 2015, Purple Duck Games published Drow of Porphyra - Karza, Children of the Loomqueen by Patricia Willenborg without the Pathfinder Compatibility License. This products explore some mature themes that were appropriate for the content of the product and for our Lands of Porphyra Campaign Setting but not for the compatibility license.
As 2015 progressed, we released more supplements using open game content from the Pathfinder Roleplaying Game but abandoned our claims of official compatibility as we actively worked to change some minor aspects of the game both in our products and at my gaming table. Now with the recent announcement of what is generally being referred to as Pathfinder 2.0, we have decided to formalize our work as the Porphyra Roleplaying Game.
- from the publisher's blurb