Decades: 1180s 1190s 1200s 1210s 1220s - 1230s - 1240s 1250s 1260s 1270s 1280s
Years: 1233 1234 1235 1236 1237 - 1238 - 1239 1240 1241 1242 1243
Births
Deaths
... deemed by copyright holders to be unacceptable. See Professor Edward Felten's freedom-to-tinker Web site for information and pointers. An early example of a DRM system ...