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Use the "Other" reason on the form (fortunately, we don't get enough of these reports to justify making ...
The 100% legal answer is complicated because it dives into the murky jungle of copyright law and the fair use defense, but the answer is "should be OK as long as you don't overdo it."
For a real, legally valid opinion on this question you'd have to ask SE to ask a lawyer, which I am not. However, in layman's terms, what we do with images from movies is ...
Looking over the transcript it certainly looks like YouTube user BessY has intentionally plagiarised content from my answer without attribution.
BessY: This issue is dealt with, somewhat partially, in a canon book called the Ultimate Star Wars
Me: This issue is dealt with, somewhat tangentially, in the Ultimate Star Wars factbook.
Both: [Identical ...
Bottom line: I strongly suspect that this YouTube user stole the question concept and the answer for their video.
You can't copyright a question or answer concept. Copyright controls text or presentation. So even if someone does steal the idea of quoting particular sources, that's not copyrightable. The sources might conceivably claim that their ...
Disclaimers: IANAL (I am not a lawyer), nor do I represent SE in any way (I'm a volunteer moderator on this site and do not speak for the company).
From the Stack Exchange Network Content Policy:
Copyright. Using copyrighted material does not constitute infringement in all cases. In general, however, users should be careful when using copyrighted content ...
Whatever the legal requirements, I think there is a moral obligation to attribute the source, even under these circumstances.
That said, I think users should be encouraged to write content in their own words, and, hopefully, enforcing the attribution will encourage them to do so rather than admitting "stolen from [here]".
First action should be direct confrontation, then escalate as necessary
So after seeing this question, I decided to dig a little deeper. And what do you know, there's a whole lot more plagarism from here going on by this guy. Here's a few from around the same time a year ago:
How did Darth Vader know the rebel base was on Hoth? (SE)
How did Darth Vader ...
I Am Not A Lawyer but this seems like fair use to me.
In US law, that means there are four important factors to consider:
Purpose and character of the use
In this case, it would most likely fall under "for nonprofit educational purposes".
Nature of the copyrighted work
Not really an issue here; it's not something that ought to be in the public domain.
I will answer slightly off-topic, since there's nothing much to add on-topic to existing excellent answers.
Leaving aside the issue of copyright and attribution, if you are literally copy/pasting the content of tag wiki from one site to another, your tag wiki content is likely wrong!
Because tag wiki content is meant to clearly explain not simply what ...
As Kevin points out, you have a moral obligation to attribute the source of your cross-source. However, it's more than just a moral obligation, it's also a requirement of the CC-BY-SA. (look at the bottom right of every single SE page for the square logo and a link to the appropriate CC terms).
There's no mechanical enforcement, but that's where community ...