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There's no requirement to provide a list of the copyright owners. The licenses require you preserve the copyright notices and the authors have chosen to refer to themselves as "The Go Authors" or "The Android Open Source Project" so you just have to preserve the notice as is.
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In this case the individual files refer to an actual notice elsewhere instead of having a bunch of them for each file. They distribute each notice variation with software like Android. If a project has 10 files different variations of the notice, they actually ship 10 of them.
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