[License-discuss] License which requires watermarking? (Attribution Provision)

[Ken Arromdee]

On Mon, 31 Dec 2012, Rick Moen wrote:
> I conclude that, in general, the overwhelming majority of such
> entrepreneurs are thus seeking the crippling of competing commercial
> reuse -- not just attribution.  So, OSI should give them the bum's rush.

Some people use ordinary GPL on libraries with the intent of crippling
competing commercial reuse (since any competitors have to release their source
and competitors wouldn't want to do that).  Is the GPL also considered unfree
when applied to libraries?