Sam Liddicott <sam@liddicott.com> writes:
And therefore you can't mix GPL with AGPL; because if you move to AGPL you
add additional requirements to the GPL'd code which is forbidden by the
GPL.
Section 13 of GPLv3 prevents this problem:
13. Use with the GNU Affero General Public License.
Notwithstanding any other provision of this License, you have permission
to link or combine any covered work with a work licensed under version 3
of the GNU Affero General Public License into a single combined work, and
to convey the resulting work. The terms of this License will continue to
apply to the part which is the covered work, but the special requirements
of the GNU Affero General Public License, section 13, concerning
interaction through a network will apply to the combination as such.