Is editing a comment in SO copyright infringement?
<p>As stated at the bottom of this page :</p>

<blockquote>
  <p>site design / logo © 2017 Stack Exchange Inc; user contributions
  licensed under <a href="https://creativecommons.org/licenses/by-sa/3.0/" rel="nofollow noreferrer">cc by-sa 3.0</a> with <a href="https://stackoverflow.blog/2009/06/attribution-required/">attribution required</a></p>
</blockquote>

<p>I would assume this also applies to comments.<br>
The attribution part is what I think gets infinged upon when a comment is edited.</p>

<blockquote>
  <p>Attribution — You must give appropriate credit, provide a link to the
  license, and indicate if changes were made. You may do so in any
  reasonable manner, but not in any way that suggests the licensor
  endorses you or your use.</p>
</blockquote>

<p>When a comment is edited by an user different than the original poster there is an small icon for it. And a tooltip pops up with the number of editions.</p>

<p><a href="https://i.stack.imgur.com/jVQA8.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/jVQA8.png" alt="enter image description here"></a></p>

<p>But no mention that this is not the text by the original author is made.</p>

<p>Is this usage of the user posted comment in agreement with CC BY-SA 3.0? Are there other stipulations besides CC BY-SA 3.0 that apply?</p>

<p>I'll clarify my understanding of your hypothetical.</p>

<ul>
<li>X authors a comment.</li>
<li>StackExchange publishes that comment, under a CC BY-SA 3.0 license, properly attributed to the original author</li>
<li>Y edits that comment.</li>
<li>StackExchange continues to publish the comment, still under a CC BY-SA 3.0 license, properly attributing the original author, X, but does not give any attribution to Y for their contributions</li>
</ul>

<p>In this scenario, Stack Exchange is properly respecting the license agreement with X. X is still given attribution, and the comment is still CC BY-SA licensed, and it indicates "<em>if</em> changes were made". StackExchange has no duty to X to display <em>who</em> made the changes.</p>

<p>Stack Exchange <em>may</em> be failing Y, by not giving them any attribution for their edit. However, edits to a comment are often so minor that they are not copyrightable (deletions, copyediting, link fixing, etc.). If the contribution isn't even copyrightable, it doesn't matter that Y isn't given attribution.</p>

<p>Y certainly isn't infringing X's copyright. X is given the required attribution.</p>

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