Originally Posted by Fizzlemizz
Authors unless specifically noted are usually happy for their addons to be used in compilations so long as they are listed on your page (a requirement here at WoWI).
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While that may be an accurate statement regarding authors' opinions, it has no basis in copyright law. Uploading the addon as part of a UI compilation package
is distribution, as a "collective work". It's the same as publishing an anthology of poems or short stories. You still need permission.
That said, the reason that big corporations are such obnoxious trolls about asserting their copyrights everywhere is because courts have generally held to a "use it or lose it" philosophy, in that allowing people to keep distributing your work (and collective works containing it, and derivitave works made by modifying it or copying parts of it) you are implicitly giving them and everyone else permission to distribute and/or modify your work.
So, if you're seeing addons in lots of compilations already, and you're not modifying the addon, I'd say go ahead and include it.
If you are modifying it, though, I'd suggest changing the name (even if it's just to add a suffix, eg "!Beautycase-MOD") and including a prominent note on your compilation's download page, so that if users ever see an error message from it, or have some other problem with it, they know to come to you about it, and not waste the original author's time.
Personally, I chose to explicitly spell out all of this stuff in my addon license, so nobody has to be confused. You're allowed to use any or all of the code from any of my addons, and you don't have to give me credit (though you can if you want). You're also allowed to include them as-is in compilations. However, if you make any changes, you have to completely rename the addon so nobody can confuse it with my original addon, because I don't like wasting hours trying to figure out why a bug is happening only to learn that the bug doesn't exist in my code at all. You also can't upload the addon by itself to another website, because I don't like the idea of leech sites making money (generally via ad impressions) off my time and effort, and because if users download it somewhere I don't know about, there's no way for me to answer any questions or fix any bugs they post there.