The original btar program is created and owned by Lluís Batlle i Rossell, and licensed under the GPLv3 (which you can find in ./LICENSE.GPLv3, as well as the original tarball). I'm just a mediocre script kiddie who's trying to make a version of btar that I can submit to the FreeBSD ports tree. (with the author's permission, of course.)
Matthew Pherigo hybrid120@gmail.com