Well, that's the best way I have to describe it.
Currently, there's 7 copyright tags for .hack// stuff:
.hack// (the generic franchise)
.hack//dusk (the manga/second anime)
.hack//g.u. (the second set of games)
.hack//liminality (OVA series, unimportant to this, has only one post)
.hack//games (only games, as opposed to the whole franchise)
.hack//roots (third anime)
.hack//sign (first anime)
There’s a couple problems with several tags
.hack//dusk: There is no such copyright. Dusk is a popular mistranslation of “tasogare”, from the original “.hack//Tasogare no Udewa Densetsu”. The actual name in English is .hack//Legend of the Twilight Bracelet. I think I already rambled enough about why I’d prefer the English title (seriously, it even says the exact same thing, only more people can understand it) but do whatever you see fit. In addition, it is sometimes colloquially called “.hack//UdeDen” in Japan, an abbreviation of Udewa Densetsu.
.hack//roots: The tag is painfully misused. I think I’ve seen a grand total of one image of a character that appears only in the anime, the rest are just Tabby or Haseo, and not even Haseo in his beginner model he used in the anime. Since Roots is part of the whole G.U. segment of the franchise and there are virtually no images of anyone that doesn’t appear in the game, I really see very little purpose for this one, it’d be like tagging the individual G.U. games. Mass edition possible?
.hack//games: This one just seems redundant. It’s somewhat of an arbitrary separation for game-only images that just excludes SIGN and what little there is of UdeDen. UNLESS the tag was originally meant for what I’m about to say and got confused along the way:
Whatever you’d call the original four games: Infection, Mutation, Outbreak and Quarantine. I think I’ve seen “.hack//IMOQ” used as a nickname, though this section of the franchise doesn’t have a proper name like G.U. does. However, there ARE a couple of these game-only images around and unlike Roots and G.U., the cast of the games is for the most part unique to them and doesn’t mix (too much) with SIGN or the rest. I’m willing to go and tag those images myself, but I thought I’d ask since it’s basically a tag I’m somewhat making up myself.
Updated by salarta