Last Sukkot 5771 (2011), Efraim Feinstein shared the sourcesheet for his late night shiur (lesson) on copyright in Rabbinic Halakhah (Jewish law). Efraim’s research adds a great deal of important perspective to our work here on the Open Siddur Project. It provides relevant historical context for our work advocating the adoption of free culture principles and free-culture licenses to facilitate sharing (tachlis) within the Jewish world.