[dang]

[flagged] on a post means > N users flagged it for a fairly large value of N. We don't know why users flagged it, but in this case I'd guess it's either because the material is politicized or because it requires a registration to download.

HN hasn't proven capable of discussing articles like this without devolving into a partisan spat, so I'd say the flags are reasonable.

[paradite]

It is probably the first case because I can download (view the pdf) without registering.

[dang]

I was asked to register, so I suppose some others were too.

[paradite]

Ah, never mind, I see the "Welcome, [my university name] user." message on the top header.