> It depends how restrictive you *intend* to be. BSD, MIT, Boost, 
> Creative Commons, etc are for genuinely free software. 
> Free as in FFAU: Free for Any Use. Do what you like with it!

The majority of Creative Commons license is definitely not "FFAU".

> EG: GHC Haskell is currently trying to dump GMP because
> of the licence. GMP is LGPL, GHC is BSD: dependence on GMP
> is therefore a serious barrier to people using Haskell in
> industry.. not what the authors want. (Plain LGPL doesn't
> have a static linking exception as Ocaml's libraries do).

It does, and it's quite straightforward to fulfill.  I don't think
this is a significant issue, and the "get rid of GMP" project doesn't
appear to be terribly successful.