V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

AUP
       Acceptable Use Policy (NFSNet)


The Jargon File (version 4.4.7, 29 Dec 2003):

AUP
 /A?U?P/

    Abbreviation, ?Acceptable Use Policy?. The policy of a given ISP which sets
    out what the ISP considers to be (un)acceptable uses of its Internet
    resources.


The Free On-line Dictionary of Computing (30 December 2018):

AUP

   acceptable use policy