USE CASE Source code delivery OR Binary delivery YOU MUST Provide License text ATTRIBUTE Viewable YOU MUST Provide Legal notices IF No Legal notices YOU MUST Provide "W3C Software Short Notice" https://www.w3.org/Consortium/Legal/2002/copyright-software-short-notice-20021231.html IF Software modification YOU MUST Provide Modification notice YOU MUST Provide Modification date YOU MUST NOT Promote