[stonyarc]

Originally Posted by vissa

I'm all for giving the author credit. But what exactly does this mean?

This means that at this point you cannot build a business based on the tool. Or sell the tool for your own benefit.

The full link http://creativecommons.org/licenses/by-nc-sa/2.5/

You may not exercise any of the rights granted to You in Section 3 above in any manner that is primarily intended for or directed toward commercial advantage or private monetary compensation. The exchange of the Work for other copyrighted works by means of digital file-sharing or otherwise shall not be considered to be intended for or directed toward commercial advantage or private monetary compensation, provided there is no payment of any monetary compensation in connection with the exchange of copyrighted works.

I hope this explains it a bit.