If Fairey's Hope is not fair use, Warhol's Prince rip off most certainly isn't. https://en.wikipedia.org/wiki/Barack_Obama_%22Hope%22_poster#Origin_and_copyrig

If Fairey's Hope is not fair use, Warhol's Prince rip off most certainly isn't. https://en.wikipedia.org/wiki/Barack_Obama_%22Hope%22_poster#Origin_and_copyright https://en.wikipedia.org/wiki/Barack_Obama_%22Hope%22_poster...