Was the retroactive change to CC BY-SA 4.0 approved by Stack Exchange's lawyers?

If things aren't moving quickly enough for you, consider sending a DMCA takedown notice instructing them to take down every question, answer, comment, and edit that they purport to distribute under a license you have not licensed it under. State that since they are not distributing it according to the terms of the appropriate licence, they can only be distributing it under the terms of the TOS, which do not permit SE to relicense the content or their users to reproduce it. State that you have a good faith belief that by purporting they are distributing your content under a license it does not have some of its users will commit copyright infringement and this SE is committing vicarious and contributory infringement.

This will cause then to have to make a choice quickly. The DMCA's protection from secondary liability may not even apply in this case, but it certainly won't if they don't remove the content expeditiously after receiving the notice, and they certainly won't be able to claim they weren't aware of the problem. They might also simply cure the problem by displaying the correct license.

The best thing is that this forces then to act quickly instead of going through a slow legal proceeding. You don't even need to be correct in a final analysis. You have a good faith belief that your rights are being violated, and this legal argument is certainly colorable.

More of an addendum:

I appreciate your efforts to acquire clarity regarding this topic, and if a lawsuit is the only way to get SE Inc. to respond, then be it.

In order to support your efforts:

• That small header on your question about the GoFundMe ... probably doesn't draw much attention.
• Maybe another question can help with that.
• Beyond that, I agree with some of the comments on that new question: that GoFundMe needs more details. The exact scope/goal, what happens to the money in case the goal is reached, but the money can't be spend as planned, ... such things.

My reply does not fit in a comment, so posting as an answer. Sorry if this is not appropriate.

I'm not a lawyer so take this with a grain of salt. However, I do have some experience regarding content rights from running a photo community, where this topic is even more important. I'll share my experience and take, and will leave it up to you to value it or not. Don't see it as advise, just information and food for thought.

Basically, I agree with @jhpratt.

That seemingly long list of rights SE is claiming on content is in fact the bare minimum for a site to display user-generated content in common and practical ways. It's a content usage license found everywhere in countless varieties. Translated into practical purposes, this is what it will allow:

• Simply showing your content (in various ways)
• To do so without expiration
• Showing (parts of your content) on social channels or future first party products

The claim to do the above even after your explicit removal of content seems an aggressive claim, yet is highly common. This is typically in place to avoid integrity problems. As a simple example: in a forum thread, if any important participant's messages were deleted, it could render the entire thread useless as all context is gone.

It is a reasonable and practical claim to make for that purpose. Even in Europe, GDPR user data deletion requests do not oblige the site owner to delete the user's forum messages, at best they would be anonymized. At least this is the consensus I've read about many times, but don't quote me on it.

Nothing in the text suggests a claim to relicense. A claim to relicense has to be very explicit as it is an extreme and very uncommon claim to make. It is basically a full transfer of content ownership. If that was the intend, the legal claim could be a whole lot shorter: we take full ownership and claim unlimited control of your content.

Which is not the case, instead, specific claims are made. And the claims made are the same claims made at any user-generated content site. You cannot even run such a site without the above bare minimum claims.

The only hot word in the claims is "modify". Very likely this is for the purpose of displaying content in altered form or it could refer to moderation, your content being changed by others.

A far-fetched interpretation of "modify" could be that it allows for anything. This is extremely unlikely:

• The wording is too vague to hold up in defense
• As said, all other claims would be unneeded, as it would overrule them
• It goes totally against earlier claims made (content is owned by community)

So no, SE does not seem to claim the right to relicense. They do seem to be taking that right though. I don't know enough about CC to know whether this is legal, but from what I read, probably not.

I suspect good intend though, which I consider important. Moving from CC3 to CC4 does not suggest a power move that is deeply in their self interest. As far as I know, it does not really give much additional control of your content, nor does this open up ways for SE to use content in ways most people would not expect. In fact, if you read what's new in CC4, it even gives slightly more control to content owners.

I cannot answer your original question (was it passed by lawyers?), but at face value, it does not seem a move that was well researched.

I conclude that you are likely right. The next question is at what cost do you want to be right? If such a move is technically not legal yet has done no actual harm to your rights nor has it benefited SE much, is it worth it to pursue the path you're on?

Imagine if after a long and costly personal journey you'd win. The consequence would be that SE cannot move to CC4, as it would need permission from every user ever. Therefore, all the improvements to CC4 would not be realized.

Where is the win? There is none. The best case scenario is a loss.

This has been answered elsewhere, but the ToS includes two license clauses, one of which is CC-BY-SA, and the other is this:

You grant Stack Exchange the perpetual and irrevocable right and license to use, copy, cache, publish, display, distribute, modify, create derivative works and store such Subscriber Content and to allow others to do so in any medium now known or hereinafter developed (“Content License”) in order to provide the Services, even if such Subscriber Content has been contributed and subsequently removed by You.

Retrieved from https://web.archive.org/web/20131014025738/https://stackexchange.com/legal, and there's a similar clause in the current version.

More broadly, of course SE isn't going to make public statements about this kind of thing on demand, that not only encourages more noise by people quibbling over things, but if it's an official statement it can have concrete legal ramifications.

Regarding copyright law, this is the section of the US copyright code that establishes the "rights"

Subject to sections 107 through 122, the owner of copyright under this title has the exclusive rights to do and to authorize any of the following:
(1) to reproduce the copyrighted work in copies or phonorecords;
(2) to prepare derivative works based upon the copyrighted work;
(3) to distribute copies or phonorecords of the copyrighted work to the public by sale or other transfer of ownership, or by rental, lease, or lending;
(4) in the case of literary, musical, dramatic, and choreographic works, pantomimes, and motion pictures and other audiovisual works, to perform the copyrighted work publicly;
(5) in the case of literary, musical, dramatic, and choreographic works, pan-tomimes, and pictorial, graphic, or sculptural works, including the individual images of a motion picture or other audiovisual work, to display the copy-righted work publicly; and
(6) in the case of sound recordings, to perform the copyrighted work pub-licly by means of a digital audio transmission.

Retrieved from https://www.copyright.gov/title17/title17.pdf

As far as I can tell, SE has granted themselves all pertinent rights via the above ToS, so SE possesses those rights via an unlimited license. Copyright law doesn't say anything specific about this situation because a license is handled by contract law, which is it's own thing. But if you have a right, you can make a contract that further grants access to the work in question that exercises that right.