Open or Closed, Part II: License and Free(dom)

I found another portion of the open or closed question.  What about open and closed software licenses? Here’s a quick rundown of the license categories (check here for more details): GNU GPL type licenses.  Very open. Liberal Licenses (i.e. Creative Commons type, Mozilla Public License). Mostly open. Closed source (i.e. proprietary license).  Closed. The more [...]