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> > This licencing model wouldn't be appropriate for a community-centric database, such as PostgreSQL.

> I don't disagree.

> It's interesting, though, how counterintuitive this is. I would think that GPL wouldn't be a problem for individual contributors (the types of participants I imagine when I think of a "community"), but for business contributors who don't want competitors to take advantage of their modifications. And yet, anything a business contributes back to an MIT/Apache project is actually less protected than a contribution to a GPL project.

Well, a lot of them want to, at least temporarily, distribute some features without releasing them. And that simply doesn't work for GPL projects, unless there's a sole owner and all external contributions are made under some form of CLA. There's a lot of open-core type projects, but in my experience they're on average less healthy than projects with multiple contributing entities.

For PostgreSQL there've been a lot of closed source forks, but a lot of them folded and/or couldn't keep up with the amount of changes and thus are based on some super old version (hello Redshift, hello Greenplum). The only ones that appear to be able to keep up are ones 1) that move more invasive changes upstream after a while and religiously rebase after every release, never delaying, or 2) move their modifications into extensions, possibly adding the necessary extension APIs to core PostgreSQL.




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