The source is open for a reason. If you'd like to reuse or rebuild any of it, go right ahead. I don't have an explicit license on my code, so if you reuse my code you can do what you like (close its source, charge fees, etc.) However, for the good of the DF community I would encourage you to open source your project as well.



To be a bit pedantic, it appears that according to github your code is currently published under GPL v3, which is a "sticky" / copyleft open license. If you want people to be able to do what you describe above, you should probably put it out under a dual license, GPL plus something like either the MIT or FreeBSD licenses. Or just place it fully into CC0 if you're up for it. But please remember that "I don't have an explicit license on my code..." means that *no one* can use it; in the US and many other places, code is copyrighted "from birth", and only explicitly setting a license can free it for others. (If you or anyone else publishing DF add-ons need more help with license selection or implications, the forums have several people with experience.)