>You cant have Open Source without copyright as the enforcement mechanism.
Enforce what. Attribution? Open Source software doesn't requires software to require attribution for it to be considered open source. Public domain software can be open source.
The license. Public domain and open source are distinct, IMO, legally, and with regards to communities (or lack thereof).
> Public domain software can be open source.
Maybe? I can't name a single public domain project off the top of my head, but I can name at least a couple for each of the Apache, BSD-/MIT-style[1] or GPL licenses.
I got curious on how they solved contributions since "public domain" means different things in different jurisdictions[0] - unlike copyright. It turns out they didn't solve it - there's a subsection on the SQLite that declares it is "Open Source, nor Open Contribution[1]". Much like Android, this follows the letter of Open Source, but not the spirit of it.
I'll stand by my earlier assertion; wrangling public domain AI contributions is an even gnarlier problem to solve.
0. Indeed, it may even be non-existent. Maintainers would want to protect the project from being "infected" by contributions with permaglued-copyright.
Enforce what. Attribution? Open Source software doesn't requires software to require attribution for it to be considered open source. Public domain software can be open source.