I am no expert myself but as far as i know, the license is all about copyright. So because you( more spec. AMD ) is the copyright holder and copyright law grants certain rights ( e.g. prohibiting copying, modifying, etc ) only you can add the GPL notice, which does in fact only state that you forever revoke some of the rights granted to you by copyright law. If somebody else does add the notice you, the copyright holder, still has the right to sue for copyright infringement whenever it is convenient, because you did not grant the right to modify the code in the first place. The problem is, even if you state per mail that you have no problem with somebody else adding the GPL notice, such an written agreement is not enforecable in court in most of the countries on this planet. And another problem is that the "All rights Reserved" clause is as far as i know not compatible with the GPL, because you cannot reserve all rights at the same time you willingly give away some of them. For more detailed information you should probably go to groklaw.net or ask your in house lawyers. http://www.gnu.org/licenses/gpl-faq.html is a pretty good source of information too.
Kind regards, DevH
To my personal understanding, copyright is copyright, license is license.
Every code in LinuxBIOS is under GPL.
YH
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Devils-Hawk