My personal view is that I want the data I contribute to continue to be available and of use, even if the worst were to happen, and OSM were to disappear, so I opted for PD. Yes, some people might then try and sell it, but there's more chance others will continue to provide it for free so they will be less successful at this.
OpenStreetMap
Discussion
Comment from Olli17 on 2010年11月25日13:54
It was an mistake you did. OSM should be under cc-by-sa and not under this new licence.
Comment from Zartbitter on 2010年11月25日16:39
it is not up to others to judge on hackery's decision.
Comment from Komяpa on 2010年11月26日07:15
Olli17, any better arguments than "should be"?
Comment from c2r on 2010年11月28日09:53
My personal view is that I want the data I contribute to continue to be available and of use, even if the worst were to happen, and OSM were to disappear, so I opted for PD. Yes, some people might then try and sell it, but there's more chance others will continue to provide it for free so they will be less successful at this.