fair use only covers distribution. "Examples of fair use in United States copyright law include commentary, search engines, criticism, parody, news reporting,

fair use only covers distribution. "Examples of fair use in United States copyright law include commentary, search engines, criticism, parody, news reporting, research, and scholarship. Fair use provides for the legal, unlicensed citation or incorporation of copyrighted material in another author's work under a four-factor test." https://en.wikipedia.org/wiki/Fair_use https://en.wikipedia.org/wiki/Fair_use Copyleft which is the AGPL only cover distribution. "Copyleft applies only when a person seeks to redistribute the program. Developers may make private modified versions with no obligation to divulge the modifications, as long as they do not distribute the modified software to anyone else. " https://en.wikipedia.org/wiki/GNU_General_Public_License https://en.wikipedia.org/wiki/GNU_General_Public_License