To bring my post from another thread here.... NOTE: I am in NO way telling you that I don't think you should pursue your rights, or that you have a right to protect yourself. Nor do I think you should just let someone take your work if you have the ability to protect it. Trust me, as someone with a lot of intellectual property int he business I do I absolutely believe in protecting IP :) I am trying to understand what IP you are talking about, and trying to see how it fits with what I know on the topics. ----------------- While I certainly can see where you own the source code, and you may well have a case to get yourself involved in the process there are some things that are worth noting: 1) No one "owns" file formats as far as I can tell. You may have a patent on a specific process used to create or decode them, but the file format itself is just data. 2) The "basic concept" of these utilities has a long history of prior art out there. Heck, the unix "diff" and "patch" utilities could be a tamplate for this type of thing... and certainly public key cryptography is. So it might be best for someone to avoid using the PCF format if you wish them too because you did a lot for the Poser community... but anyone could write a program with a similar function without having to really worry about anything as far as I know. For instance, a utility like this with an XML underpinning would not be a big problem.