GPLv3 前文 > you must pass on to the recipients the same freedoms that you received. 10. > You may not impose any further restrictions on the exercise of the rights granted or affirmed under this License. ttps://www.gnu.org/licenses/gpl-3.0.html
GPLv2 4. > You may not copy, modify, sublicense, or distribute the Program except as expressly provided under this License. 6. > You may not impose any further restrictions on the recipients' exercise of the rights granted herein. ttps://www.gnu.org/licenses/old-licenses/gpl-2.0.html