[kouteiheika]

> Is there any way to show a real commitment upfront to openness?

Of course there is. Don't require a CLA and use GPL instead of permissive licenses. Then any derivative work will have to legally be GPL compatible.

[zeckalpha]

More details on the why behind no CLA: There are dual licensed GPL/Proprietary projects out there. The trick is whether copyright is assigned to a singular entity. If copyright is retained in a distributed (but licensed) manner, then it is harder to relicense.