> In the case of the later 3 files, their copyright notice says:

quoted text
> 	"at your choice" you may distribute under the terms of the BSD

> 	license or under the terms of the GNU GPL v2

>

> So if they chose to distribute those 3 files under the terms of the GNU

> GPL v2, it is correct to change the copyright notice of those three files

> alone in order to remove a license that the distributor chose not to use

> anymore.

Not exactly.  I won't quote from the GPL again, but even the GPL has a

paragraph about this.  You must pass on the rights you received.  The

GPL says that passing on only a selection of rights is not fair.  Don't

trust my words, though, go read the GPL yourself.