I am trying to use SUS scale in my study, but wondering about the process of getting permission or paying the fee for using the scale. I could not get any hint from Google search. Thank you in advance.
It's free and you don't need any permissions, just mention the methodology used in any published work. It's a bit outdated and unreliable, though. Even the page in usability.gov states that everything there may be incorrect and/or out of date.
Usability.gov is archived and no longer updated
External links may not function and information on the site may be out of date. Visit digital.gov for current information.
and a search for SUS on digital.gov leads to the same page in a loop, so...