Each Public Domain Day seems to bring us a richer crop of copyright-liberated books, plays, films, musical compositions, sound recordings, works of art, and other pieces of intellectual property. This year happens to be an especially notable one for connoisseurs of Belgian culture. Among the characters entering the American public domain, we find a certain boy reporter named Tintin, who first appeared — along with his faithful pup Milou, or in English, Snowy — in the January 10th, 1929 issue of Le Petit Vingtième...