Forty years ago, it started with the four freedoms; today, the GNU Project, GPL and other GNU licenses, and copyleft is still going strong; on September 27 and October 1, we're celebrating those hard-won freedoms in Biel (Switzerland) and Boston, MA (USA). Read more about our hacker history and these upcoming events: https://u.fsf.org/40k #GNU40 #GPL #FreeSoftware #Copyleft #HackDay #Hackers #HappyHacking #FourFreedoms