It is not different from the Creative Commons Attribution ShareAlike license or the GNU General Public License v2+. It does not extend to content that is not derived this model.
makedeb, originally called Debian User Repository (DUR) is an AUR clone for Debian derivatives. Packages use the PKGBUILD format just as in Arch, and is mostly similar, but with changes such as use of package names based on Debian.
It also tries to support distribution specific changes, but I don't have much details on how effective it is. I don't use a Debian derivative system myself.
You cannot view the PKGBUILDs from the site, but you can clone the git repo which will contain just the PKGBUILD. The MPR subdomain and git clones seemed laggy to me, but it eventually loads (took about ~18s).