You should seriously consider consulting an attorney. There are clear contradictions in your statement, "Further, the code is in the public domain under the GN

You should seriously consider consulting an attorney. There are clear contradictions in your statement, "Further, the code is in the public domain under the GNU GENERAL PUBLIC LICENSE Version 3"; code that is under the public domain does not need a license. The GPL requires that you have a copyright so that you can license the software under its terms.