PBPL is a public LICENSE for open software that requires users who make changes to your software to share their changes back with the community.
PBPL is based on Parity, a license published by Artless Devices LLC for licensezero.com. Other licenses in the family:
- Charity, a permissive license
- Parity, a strong reciprocal license
- Posterity, a strong-attribution license
- Prosperity, a noncommercial license