@Shamar @kaniini @starbreaker @rysiek I'm skeptical of and concerned about commercial exploitation too. Problem is, "noncommercial" doesn't fix the things you'll expect it to, and will prevent things you want.
Here's a question: if Linux were noncommercial, should a community run nonprofit be legally allowed to run it in a commercially run hosting service / datacenter? Even if the hosting service profits from it? Can the cooperative collect dues?
CC's interpretation of NC is purposefully vague to be flexible: https://wiki.creativecommons.org/wiki/NonCommercial_interpretation
In my opinion, that doesn't make it very useful; NC is mostly a barrier to combining with other FOSS licenses, especially the big copyleft licenses.
In some cases, artists and musicians feel more comfortable with CC licensing... 1/2
@diggity @rysiek @cwebber @Shamar @starbreaker
"Where do you put the attribution?" Sec 3(a) of the CC-BY-SA licence covers this.
Copyright holder gets to define a "reasonable manner" (3.a.1.i)
#OSM has a form letter ( https://drive.google.com/file/d/0B3PN5zfbzThqeTdWR1l3SzJVcTg/view ) which asks the holder to agree that a mention on the osm.org/copyright page suffices.
Also CC licence forbids use with DRM (2.a.5.c), OSM licence allows it if you offer parallel download.