question about the critical gained from license

[NotMyWay]

from what i read from FiestaWiki, "Only the highest Critical +% is applied on any weapon. Therefore, if you achieved +1%, +2% & +3% on a weapon, you will not get +6%, but +3% boost. ". Can someone please clarify if this also means that if i have 2 licenses in 1 weapon, i can only get the critical from 1 license? thanks.

edit: also, i was wondering is it advisable to put 3 of the same license in 1 weapon?