Hi Kevin, Thank-you for the response, and the clarification regarding the DriverKit entitlements. FWIW, one does in fact need a paid Developer Account to access them. I had one quick follow up regarding the UserClient implementation. I haven't gotten it to work yet (Failed opening connection to dext with error: 0xe00002c2), although it is thus far essentially an implementation of the example app. There could be many things wrong, but perhaps you could advise if the entitlement com.apple.developer.driverkit.userclient-access is absolutely a requirement here to develop a Dext that implements a UserClient connection? (the example app itself doesn't want to build because I don't have it) If it is, then is there a different process between requesting a development vs. distribution version of this entitlement? If not, is there some trick to get the communication to work? Thank-you in advance!