I don't know how to find the earlier discussions of the problem, that unrelated sites seem to hold copies of MO (and/or of other SE sites) [I searched meta.mo with keywords "clone", "copy" "piracy"... but those keywords didn't help] but I think I remember a remark anywhere that such cases should be reported.
When I tried the google search for "zeta isogone" (to see how google positions its findings - inspired by the other discussion on meta) I find

(I removed some google-specific content in that link, I hope it works anyway)

Ah, and I don't find a good tag for tagging this correctly, sorry, perhaps someone might help here

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    $\begingroup$ "Scraper" might be the search term you want. $\endgroup$ Commented Nov 22, 2015 at 11:28
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    $\begingroup$ The license allows to create and distribute copies of MathOverflow content, but it must be properly attributed. On the site you refer to, as far as I see, authors of posts are not mentioned. $\endgroup$
    – Stefan Kohl Mod
    Commented Nov 22, 2015 at 11:33
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    $\begingroup$ A related questions listing some mirror sites. $\endgroup$
    – user9072
    Commented Nov 22, 2015 at 11:34
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    $\begingroup$ @GerryMyerson Indeed, it might, but trying it, nothing much of relevance turns up on meta.MO when searching for this. However on MSE one finds something meta.stackexchange.com/questions/200177/… $\endgroup$
    – user9072
    Commented Nov 22, 2015 at 11:37
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    $\begingroup$ I added the tag copyright, and created the tag mirror-sites. $\endgroup$
    – user9072
    Commented Nov 22, 2015 at 12:25

2 Answers 2


There is a detailed discussion of how to proceed on Meta Stack Exchange: A site (or scraper) is copying content from Stack Exchange. What do I do?

This more-or-less applies to MO, too, as MO uses the very same license. See for example Who owns my MathOverflow posts? for information on the license.

As a general point note that as explained in a comment by Stefan Kohl and also on the linked post, it is not always a problem if a site reproduces content, even sizable parts of it. But, there are rules to follow.

In brief steps to take could be:

  • Convince yourself if the rules even are/seem to be violated.

  • If feasible and in minor cases, say the content of a single post, and where it might just be an oversight, signal the problem to the entity reproducing the content in violation of the attribution rules.

  • If the preceding point is not feasible or does not have the desired effect report the problem. See an other answer for the recommended way to do this.

  • $\begingroup$ Thanks quid for this answer (and for the previous links) $\endgroup$ Commented Nov 22, 2015 at 12:49
  • $\begingroup$ You are welcome. I think it is good this is documented somewhere, so thanks for the question. $\endgroup$
    – user9072
    Commented Nov 22, 2015 at 12:54

Since the content of MO is distributed under the Creative Commons Attribution-ShareAlike (CC BY-SA 3.0) license, many such sites are perfectly within their rights to redistribute MO content. However, they must respect the terms of the license and the attribution requirement. Sites that redistribute MO content without proper attribution should be reported here.


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