this post was submitted on 07 Apr 2025
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I would add in "automatically" there. Source-available licenses could give you the right to modify it and redistribute it, or it may not. For example, the Unreal Engine is proprietary and covered by a source-available model, and you can redistribute it to other license holders (must accept certain terms and conditions), and even then w/ restrictions. So you can take it, modify it, and redistribute it, but there are a handful of very important asterists there.
Basically, if you don't recognize the license as one of the major ones (Apache, BSD, MIT, (L|A)GPL, etc), then treat it as source-available w/ no rights other than reading it until you actually read and understand the license.
That depends on your definition of "restriction."
If you use a copyleft license, you could be restricted from using proprietary plugins, since you'd have to release the source of those plugins if a user accesses it in a covered way, and you don't have the right to do that. That sounds like a restriction to me, and it doesn't apply to more permissive licenses like BSD or MIT.
The intent of copyleft is to ensure freedoms for the recipients of derivatives of your works. In software that means the users of forks. Copyleft restricts you to the same license (or a compatible one) to prevent you adding more restrictions. ""More permissive"" software licenses can be redistributed with the same license but often it's a more restrictive license (e.g. MIT -> proprietary).
You can't remove the license, say MIT, or add any restrictions to the code. You can combine it with other works and distribute the combined work under different terms, provided you still abide by the terms of the license (e.g. source distributions need to retain the license, binary distributions don't).
Copyleft forces modified distributions to have the same terms as the copylefted software. If you have some MIT code and some GPL code and you combine it, the combined work is GPL. Likewise if you combine proprietary code and GPL, the combined work is GPL, and that'd regardless of how it's distributed.
Permissive licenses protect the source as it was when it was combined into the other work. Copyleft licenses enforce distributed changes to the source are made available under the same license. Which one you want depends on what "freedoms" you want. Do you want the freedom to use the source however you want, including with proprietary code? Then you want a permissive license. Do you want to ensure that any changes to the code are always available? Then you want copyleft code.
With the minimal amount of work added the combined work can now have added restrictions. They're pushover licenses.
Devs are free to choose whatever license they want but in the pathfinding problem of interacting with others then "protecting the source" is the wrong target node. Copyleft is a tool to help people.