As I wrote on another comment, I wasn't aware that there are multiple forms of open access. Since it appears that arxiv (again, at least high energy physics) em

As I wrote on another comment, I wasn't aware that there are multiple forms of open access. Since it appears that arxiv (again, at least high energy physics) employs mostly either gratis or libre open access, and since the Wikipedia article explicitly calls it an open access archive, I see no harm in calling it that either. "arXiv (pronounced "archive"—the X represents the Greek letter chi [χ])[1] is an open-access repository of electronic preprints and postprints[...] "