How does rabbinic Judaism value openness? What does openness mean? This sourcesheet accompanied the shiur “‘Make yourself into a Maqom Hefker’: Rabbinic Teachings on Open Source in Judaism,” a class I taught on Taz biShvat 5774 (January 16th, 2013) in partnership with the Sefaria Project for Parshat Yitro. The shiur discussed the concept of דִּימוּס פַּרְהֶסְיַא Dimus Parrhesia (δῆμος παρρησία) as a valued ideal in Rabbinic discourse: its cameo appearance in midrashic teachings on Parshat Yitro and its relationship to other relevant ideas and attitudes in the study of Torah and the Jewish stewardship of the Commons. . . .