"HN is apparently auto-creating mirrors of copyrighted content on scribd" If you look at a '[scribd]' link, you'll see that the scribd url has the original url

"HN is apparently auto-creating mirrors of copyrighted content on scribd" If you look at a '[scribd]' link, you'll see that the scribd url has the original url as a parameter, which suggests that scribd does not make copies of pdfs submitted to HN, but merely acts as an in-browser pdf viewer.