Tobias Hunger

I revolve very much around copyleft and its ideology. Free software formed my entire career, just as it did for the founders of Slint. From my point of view slint is GPL and offers some other license options for users that do not want GPL for whatever reason.

Forking slint is just as easy as forking any other GPL licensed project: Take all off slints code under GPL and you are done. Yes, you can not relicense that fork to a more permissive license without replacing all the code that you did not write… but that is exactly the same as with any other GPL project you fork. Any use of Slint under GPL is exactly as using any other GPL project, with the same obligations and protections to all parties involved.

I get that you are feeling slint is not GPL, but I do not understand where that feeling comes from. Is it “just” because there is a company backing it? Or because that company is selling their product in addition to oing it under GPL? That is fine for the GNU project from all I understand. Or is it because of contributions happen under MIT terms? But that does not effect the end users that the GPL is protecting in any way.

So to be a GPL project you need to be able to trust the project to release all future releases under GPL in addition to having released existing code under GPL?

I do not like this approach:

First of, you need a crystal ball to decide whether a project is GPL or not: Some projects managed to pull off a license change before, just by asking devs whether they are ok and replacing code from devs that did not agree. Its rare, but it happens, so checking for CLAs, copyright assignments, …, is not enough.

Secondly this definition excludes lots of projects that release their source code under GPL, including the GNU project. They ask for copyright assignment, both to defend the GPL license, as well as to be able to relicense when weaknesses in the current licenses are found. I give you that GNU is probably way more trustworthy wrt. not changing away from the free software spirit than some random company.

You are fine with a free software project using Slint as well: Slint is a GPL project, with everything that implies. The releases are out there and the slint project is bound to the terms it released them under. In theory we could release new versions without the GPL option, but we can not take the sources of the released versions away. Neither the other licensing options nor the contribution rules change that. If youbare happy with GPL dependencies, you can use Slint just as any other GPL dependency, with the same risks and benefits.

The copyright holders of any GPL project can decide to relicense their (future) releases. I admit that it is a bit simpler in Slints case due to the contribution rules, but other projects have similar rules in place. Copyright assignments, CLAs, …, they all exist to simplify a possible future relicensing effort. And even GPL projects without such provisions in place have manged to relicense before.

As a user of Slint you typically never get into contact with our contribution setup at all. Only a contributor might pause and decide not to spend time on Slint due to that. IMHO that is entirely normal: I use tons of free and open source projects that I would never contribute to – for various reasons ranging from contribution terms, to programming language being used or the projects community.

In many cases you can also publish slint related code in your own repository under whatever license you like. While this obviously does not work for core functionality that has to live in Slint itself, it does work for a wide range of things you might want to make available (like new widgets, …).

But you do get all code under GPL, which you seem to agree is a freedom preserving choice. That does make Slint free software and as save to use as any other free software project out there.

The story is a bit different when you want to contribute to slint. Slint is not a even playing field for contributions. The company has an advantage in that if can use all contributions as MIT and you can only use the companies changes under GPL, commercial, or royalty free terms.

As a contributor you need to decide whether you contribute to the slint repository, or maybe write an add-on library which you are free to license as you see fit.

You contribute code to slint under MIT and you can also use that contributed code under MIT or any other license of your choosing, it stays your code after all. You can not use other peoples code from the slint repo under MIT though, that is correct. The royalty free license tries to get as close to MIT as we can while limiting the use on embedded… but with that limitation in place it is of course not an open source license.

Contributing back to Slint is in no way required, so if you do not like our contribution terms, then you are free to not do so. Ypu are also free to use something else if you do not like our license terms.

We try to make all of the terms as clear as possible. We rewrote the Slint licensing page several times, often with extensive community feedback, to get it as clear as it is right now. If you have ideas on how we can improve, I am all ears.

You are technically correct: Slint is free software. You can get Slint as GPL or commercial terms – or the royalty free license. The latter lets you do whatever you want anywhere with the exception of “embedded” (this exception makes is not open source).

When you contribute to any MIT license project you are in the same situation: Your code will be redistributed by some company under different license terms. That’s the point of MIT & Co. You contribute MIT code to a project, the project releases its code under MIT, and a company consumes the project and restricts its use. Slint is just cutting out the middle step here.

Disclaimer: I work for Slint and appreciate being paid for contributing to open source software. I also appreciate Slint being free software.

It is unfortunately developing very slowly and it is impossible to interact with git repos… which nowadays is basically every repo:-(

Take a look at jj. It is not as ambitious, but develops faster and you can use it with any git repository out there (as long as it does not need git submodules that is).