What I mean is that it's open source in that the source is viewable, modifiable, and redistributable by anyone, but changes do not have to be contributed back (as is the case with GPL)? I've heard the traditional software licenses are problematic for web applications as well.
I believe I want the web equivalent of the Apache license, but I'm not sure. Any advice would be appreciated. Attribution is not important to me, but it is a very small plus if it comes down to it.