The product of the company I work for as a developer is closed-source and commercial. The FAQ says if it is a licensed use to automate PDFCreator. I personally love the idea of having their clients install PDFCreator in order to use their product. But before I develop PDFCreator's automation, I need a clear statement by a pdfforge responsible that it's legal. I would suggest that you add an extra license for distributing an implementation of PDFCreator automated in a closed-source and commercial product. And this should not be free. Prices for royalty-free distribution with the closed-source product should differ from the other way: Tell their clients that PDFCreator is a pre-requisite to use their product.