The first and most obvious thing to mention about the font is that the capital S "feels" upside-down because the upper loop is proportioned much larger than the lower loop. Very unprofessional.

I would like to know how to procede to get the autoraisation to use this font, if it's not only for a personal use. Thank you

I would also like to know how to procede to get the autoraisation to use this font.

Thank You

Great font! I would like to get authorisation to use on a job. Cheers

I would like to get authorisation to use this font for business purposes if possible please. Thanks.

For those of you looking for an improved version with more/better accents etc: Derek Vogelpohl has allowed me to rework his fonts and offer them with a (very generous) commercial license.
So if you need a professional quality Unicode OpenType or TrueType version of this font (just the basic font - not the artificially generated variants) with a multilingual and expanded character set - you will find it here:
http://www.cheapprofonts.com/SF_New_Republic_Pro
(Derek Vogelpohl receives royalties from all sales)