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For questions about the copyleft concept (also known as Share-Alike), a concept that promotes or enforces the use of the same or compatible license for derived works.

9 votes

Why to prefer permissive license over copyleft license?

You want contributions from people/corporations who would otherwise be averse to copyleft terms. … Using a copyleft license for Kubernetes would not have directly hurt this strategy (though it may have done so indirectly by the risk of reduced popularity -- a key facet of the plan!). …
apsillers's user avatar
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5 votes
Accepted

License where somebody can distribute modified binaries but if they do I can disassemble the...

With a copyleft license like the GPL, people can distribute their changes only under the GPL as well, and they must provide their full corresponding source code (or else you can take legal action against …
apsillers's user avatar
  • 37.7k
4 votes
Accepted

Does AGPLv3 cover a company running an application via email correspondence?

network-based source-sharing obligations in section 13 only come into effect "if you modify the Program," so if the company is only privately executing an unmodified copy of the program, they cannot have copyleft
apsillers's user avatar
  • 37.7k
12 votes

Using copyleft licenses for non-programming purposes

If you didn't have the underlying restrictions of copyright, the GPL couldn't demand copyleft terms. … It is perfectly possible to grant patent licenses to people under sort-of copyleft-like terms. …
apsillers's user avatar
  • 37.7k
8 votes

Is Open Public License suitable for libraries?

The OPL has a per-file copyleft; see analysis below. … This is not legal advice, but based on my non-expert reading, the Open Public License appears to have a per-file copyleft, similar to the Mozilla Public License, so changes to an OPL-licensed file fall …
apsillers's user avatar
  • 37.7k
11 votes
Accepted

Is it legal to remove a dependency with a copyleft license from a proprietary project?

In the United States (and probably many other jurisdictions), a court generally cannot compel you to release your source code simply because you did not abide by the terms of a copyleft copyright license …
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  • 37.7k
6 votes

Is an open-source license an incentive for companies to buy an exception?

Copyleft terms like those in the GNU GPL place obligations on distribution of the software. … Therefore, copyleft terms place an incentive to purchase an exception (i.e., a separate, non-copyleft license) only when the recipient expects to distribute the software further. …
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3 votes

Are there any real punishments for intentional malicious behavior in GPL or any other "no-wa...

In the United States, the disclaimer only disclaims warranties which are a specific kind of protection that applies to products sold to consumers. Vendors can offer whatever warranties they like to at …
apsillers's user avatar
  • 37.7k
37 votes
Accepted

Is there a generally accepted "anti-copyleft" clause or license?

license that is incompatible with other existing copyleft licenses. … In other words, whereas the GPL's opponent in employing copyleft is non-free licensing terms, your opponent in employing copyleft will be copyleft terms (except for your own copyleft terms). …
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13 votes

Will adding a BY-SA image to a blog post make the entire post BY-SA?

The CC ShareAlike terms merely say that whenever you do make a derivative work of the image, distribution of that derivative work must be under ShareAlike (or CC-approved ShareAlike-compatible) terms. …
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4 votes
Accepted

Does the GPLv3 license on my project require me to also include the source code of a tool to...

As far as I can tell, Godot is licensed under the MIT license which only requires you to preserve and reproduce a copyright notice and simple license terms. You do not need to share any of your source …
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15 votes
Accepted

"Pure Copyleft" Software Licenses? (with no additional restrictions)

It sounds like you want a copyleft license that will apply to a lineage of derivative works, forever, but which perpetually enforces downstream reverse engineering rather than downstream source availability …
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45 votes
Accepted

So the GPL doesn't restrict the creator of the software in any way?

Putting software under the GPL does not mean abandoning ownership? Absolutely not. In nations signatory to the Berne Convention, copyright is the default, which means by default only the author (o …
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2 votes

CC BY-NC-SA "ShareAlike" (source vs binaries)

This is in contrast to source-sharing copyleft licenses like the GPL, which require that binaries be accompanied by "corresponding source." …
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2 votes
Accepted

Can I dual license my software that is on Github with a GPLv3 license?

Consider a case where you release a Windows version of your own, original software, W. You release W under the terms of the GPL. You are free to offer W under other licenses, with or without further m …
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