Cryptographic Autonomy License (CAL)
A copyleft license that demands not just shared code but that users can get their own data back out.
Lawyer Van Lindberg wrote it for the distributed framework Holochain. It starts from the AGPL's premise, that running software as a service for others triggers the terms, and adds something new: whoever operates the service must give each user access to the data that user put in, and must not stop users from keeping control of their own cryptographic keys.
Getting it through the OSI was a long fight. Critics argued that a license governing data rather than code went beyond what an open source license may demand, and the first version was withdrawn in 2019. The revised CAL-1.0 was approved in early 2020. Hardly anyone uses it, but its question, whether open code means much when the data is locked up, has only grown sharper.