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While answering this question, it was pointed out to me in the comments that software that is improperly licensed (in that case, by violating another license) causes its own license to be cancelled out, thus rendering it practically unusable until fixed by the copyright holder.

The context of the question was a project licensed under CPOL that infringed on GPL code by including it despite the CPOL's no-commercial-use (and thus, non-free/libre) restriction - thereby not complying with the GPL's copyleft.

My first assumption in that case was that one could still use the CPOL-licensed project if they removed the GPL-code from it. I now believe that assumption was incorrect.

So, my question is: if I want to include in my code an open-source project (project A) that infringes on the license of another project (project B), am I still infringing the copyright of project A if I remove the code belonging to project B? If so, why?

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  • I would think that you are no longer infringing the copyright, but your license would still be subject to termination, which may be permanent depending on the license. – EMBLEM Aug 20 '16 at 4:00
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    I think the premise is wrong – it seems to me the license on the GPL code is terminated (for the CPOL redistributor), but the various portions are still usable by third parties under their respective licenses. There have been many instances in the past of first and third parties fixing licensing issues by replacing code; this wouldn't be possible for third parties if license terminations "cascaded" down the licensing chain... – Stephen Kitt Aug 20 '16 at 8:30
  • @EMBLEM In theory, open source licenses don't really "terminate." Since they're irrevocable, you just get a new copy of the project, and just because your copy may have terminated, doesn't mean that anyone can restrict you, as that would violate open source/free software definitions. Basically, just keep an unmodified form of the project in a folder, and copy whenever you need it. – Zizouz212 Aug 20 '16 at 16:19
  • @Zizouz212 Richard Stallman says otherwise, at least as regards GPLv2. "With GPL version 2, published in 1991, a violator automatically, immediately and permanently loses the license to distribute that program. There are no exceptions. To get the rights back, the violator must ask the copyright holders for restoration of rights." – EMBLEM Aug 20 '16 at 17:13
  • @EMBLEM Really? That's very interesting, I wonder how that settled through with the definitions. – Zizouz212 Aug 20 '16 at 17:16
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no, you're not infinging

if A infringes on B which it includes, then they do not have a right to distribute combined work and combined license on A is null and void.

However, all other (noninfringing) parts of A are still legal to distribute under As license, so you can take just those noninfringing parts and use them under As license (or include them in your code, whose license is compatibile with As license)

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Matija provides the answer for when you remove code from the project, and it addresses the situation for non infringing parts of the project. In the open source world, fixing it immediately often won't cause problems. Even in the event that a violation is found, I wouldn't be surprised if licenses already have some "procedure" for handling such violation. CC BY 4.0 (although not strictly open source), includes the following clause:

Section 6 – Term and Termination.

a) This Public License applies for the term of the Copyright and Similar Rights licensed here. However, if You fail to comply with this Public License, then Your rights under this Public License terminate automatically.

b) Where Your right to use the Licensed Material has terminated under Section 6(a), it reinstates:

  1. automatically as of the date the violation is cured, provided it is cured within 30 days of Your discovery of the violation; or

  2. upon express reinstatement by the Licensor.

    For the avoidance of doubt, this Section 6(b) does not affect any right the Licensor may have to seek remedies for Your violations of this Public License.

There's a few interesting things here. When you violate the license, it is terminated, but may be reinstated when you resolve the violation. However, I want to focus on the last part of this clause, which is what I had in mind when I commented on your question - liability for before you took restorative action to fix the violation.

So... We've got a few things to consider here:

  1. Was the license at any point infringed?
  2. Was the infringement wilful?

To make a more intense example, let's imagine the following situation:

Person A has full copyright on his code. He has never released it under any license, except proprietary licenses. Person B finds some code, releases it as part of another project, and licenses it under a very permissive license - the MIT license.

You find Person B's project. You think it's great, it's easy to use, moderately active (a couple of issues/pull requests a month) and all. Best of all, you can make money easily off of it! You do some due diligence, and you're happy that the project is fine, and there are no violations that you can see. You make a project, and it's pretty well off.

Let's ask the above two questions for yourself:

  1. Yes, the license is definitely infringed. You can't license someone else's work, and you can't use an improperly licensed project. The MIT license is nil and void. All rights reserved are what the terms and conditions are.
  2. Definitely not. You've done your due diligence, and you never deliberately infringed someone's work.

Let's continue with our example.

A year passes by. Your project becomes pretty successful. Now... Person A finds Person B. In the course of find Person B, he finds you too.

Person A sends you a notice, advising you to remove all his work. He informs you of his full copyright on the work, and that he never licensed it to you, or under the MIT license. As a result of this, you remove all his work.

Does this mean you are in the clear?

Unfortunately, no. Your use, and sale of his work, caused him damages, which you are liable to. However, the situation changes, if you were never wilfully infringing. Even though you fixed the situation upon receiving notice from the copyright holder, you still did infringe copyright at some point in time.

I don't want to get into the notion of damages here, since there are so many factors to consider, statutory damages, actual damages, license fees, and all that. If you're ever in this situation, get a lawyer, and get real legal advice, because I'm not a lawyer, and nothing in this post is legal advice.

TL;DR Yes, you infringed copyright, even if you did fix it after.

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