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SubjectRe: Can a recipients rights under GNU GPL be revoked? - Yes if they are free(gratis) licensees.
Yes, if the licensee has not paid anything (no money, no service, etc) 
that you asked him for, for the license, it can be freely revoked. The
"clarification" by the FSF is complete and utter bullshit (and was
prompted by my writing on the issue).

For a licensee to prevent a revocation, he must be able to enforce some
promise regarding revocation (when it can occur, etc) that the copyright
holder made to him.

In order to have an enforceable promise he must have paid the owner
something for that promise, otherwise it is an illusory promise and will
not be enforced by the court.

"Promising" to fulfill a pre-existing duty is not sufficient payment
(consideration) either. One pre-existing duty we all have is to follow
laws. Promising to not violate someone's copyright is not valid
consideration as it is a pre-existing duty.

Before the license grant the free-taker has the following "rights" to
the work:
Nothing.

After the license grant he has the following permissions regarding the
work:
(Whatever the license says).

And for that he has paid the copyright owner: nothing.

No valid consideration, no contract, any "promise" made in the license
text is illusory: it cannot be relied upon (including the "irrevocable"
clause in the GPLv3: that clause is _inoperative_ from the perspective
of a free-licensee vs the owner).

(Additionally, consideration, to be valid, must be bargained for.
Tendering unwanted "consideration" is no consideration at all, thus the
"fame is payment enough" argument from the dicta of a 9th circuit case
is of no value when the licensor did not specifically bargain for such
in exchange. You cannot hand the owner something after the fact and
declare it valid consideration)

You can revoke. You can do so for any reason or for no reason at all.



The FSF and SFLC swear that you can bite the hand that feeds you for
free. They are incorrect and purposefully deceiving you in order to
safeguard their movement against the men who actually did the work to
create the corpus it rests upon.



Note: If you would like a nice expansive legal paper to read on this
issue, Sapna Kumar's paper is good:
https://scholarship.law.duke.edu/faculty_scholarship/1857/
If that is too formal and you prefer a stream of consciousness message
board fight on this issue, the LKML has you covered:
https://lkml.org/lkml/2019/5/3/698 (and it covers the 9th circuit
Artifex case and 9th circuit Artistic License case which some people
will try to make you think invalidates your proprietary rights)
If you want a book, to have and to hold, that recognizes this:
https://www.amazon.com/Open-Source-Licensing-Software-Intellectual/dp/0131487876
If a paper by some mere lawyers isn't good enough, a law professor's
take on the subject might be more you style:
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=243237

Yes, the GPL is revocable from free licensees. Yes they will fight you
in court if you revoke from someone who cares, so when you are thinking
of revocation: 1) properly register your copyrights ... 3) Then revoke
from an entity domiciled in a property-friendly circuit that isn't going
to simply invalidate the idea of contracts requiring actual valid
consideration (IE: do not revoke from someone in the 9th circuit as your
first course of action: revoke from an entity in another circuit)

(Also note: Do not send a cease-and-desist letter off the bat: the
entity can then rush to the court house to seek a hearing regarding his
rights to the work. You don't want to be in a race-to-the-courthouse
situation and not even know it)

Part 0) and 2) are :Get [an] experienced copyright attorney(s) who is
well familiar with the leanings of the various federal circuits so you
can formulate a proper strategy. The 9th circuit loves "Big Tech" and
doesn't much care for the formalities of law, and if requiring
consideration to actually exist regarding copyright licenses for them to
be mutually enforceable contracts gets in the way of California's Tech
industry: guess how they're going to rule in a "new insightful
groundbreaking finding".



On 2019-01-27 11:47, Ben Finney wrote:
> Howdy all,
>
> Recently in this forum, some concerns have been raised about works
> covered by GNU GPL. In particular, whether a recipient of a work,
> received under conditions of the GNU GPL, can have the freedoms of the
> GNU GPL later withdrawn in that same work.
>
> To reassure those who might worry whether they can reply on the freedom
> granted in a work, it is worth reading the GNU FAQ document for the GNU
> GPL at the Free Software Foundation:
>
> [For any GNU GPL-licensed work,] the public already has the right
> to
> use the program under the GPL, and this right cannot be withdrawn.
>
>
> <URL:https://www.gnu.org/licenses/gpl-faq.en.html#CanDeveloperThirdParty>
>
> The same answer is in the FAQ specifically for the GNU GPL version 2.0
> <URL:https://www.gnu.org/licenses/old-licenses/gpl-2.0-faq.html#CanDeveloperThirdParty>.
>
> You can read more in the Software Freedom Conservancy's document
> _Copyleft and the GNU General Public License: A Comprehensive Tutorial
> and Guide_, specifically in §7.4 “GPLv2 Irrevocability”. That
> concludes:
>
> Whether as a matter of a straightforward contractual obligation, or
> as a matter of promissory estoppel, a contributor’s attempt to
> revoke a copyright license grant and then enforce their copyright
> against a user is highly unlikely to succeed.
>
>
> <URL:https://copyleft.org/guide/comprehensive-gpl-guidech8.html#x11-540007.4>
>
> In other words: Any copyright holder can *say* they wish to
> retroactively revoke the GNU GPL to some party. However, unless that
> party has violated the conditions of the GNU GPL grant they originally
> received, there does not appear to be any enforcible threat of
> revocation that would succeed.
>
> I hope these, along with the many court cases world-wide that have
> tested the GNU GPL and found it to be enforcible, can reassure those
> considering whether a particular copyright holder's whim can revoke the
> freedoms guaranteed in a GNU GPL-covered work. I'd say there's nothing
> to worry about from those threats.

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