[exabrial]

My favorite is EUPL: https://joinup.ec.europa.eu/collection/eupl/introduction-eup...

Essentially licensing your software like this behaves like ASL unless you: modify + distribute (either binaries or by creating a service). Then you owe the changeset back, but it does not have a viral clause like the AGPL.

This solves a large part of the greedy AWS problem (Amazon copying entire open source projects and contributing nothing back), but also strikes a balance and allows API Compatibility.

[debugnik]

I really like the EUPL on paper, and I've been told by Joinup's legal support that it should be a valid "change licence" for BUSL, in case I ever want that.

But I'm concerned about the compatibility clauses becoming a loophole for hostile forks. Then again, half the point of the EUPL is admitting that only a court can judge what is or isn't a derivative work (unlike the legal fiction in the GPL's viral clause), so I guess these uncertainties are part of the deal.