"Patent covenant deals done after March 28, 2007, are
explicitly incompatible with the license if they are
“discriminatory” under section 11 of the GPLv3. Samba
distributors who have made such patent covenant agreements after
that date will not have the right to distribute any version of
Samba covered by the GPLv3 (Samba 3.2 or later). The rights of
vendors to ship 3.0.25b and previous versions is unchanged and
remains as it was under the GPLv2."