Retina was commissioned by the Wall Street Journal, and so far as I know they retain exclusive usage rights. It's possible that the contract between the WSJ and Hoefler & Frere-Jones will allow H&F-J to license the font to other customers at some time, but I don't recall any announcement of a specific period of exclusivity.

Retina is used by numerous newspapers and magazines. It's definitely available for license, but you'll have to contact HFJ directly since it's not on their website.

I always misread that initialism and wonder what kind of special justification is done with H&FJ versus ordinary hyphenation and justification.

The former is for posh books where everything has to be as fine and flat-ironed as possible.

Alternatively, it is when the J is FUBAR.