Thought it might be worthwhile to note that the Sony MDS-E10 (pro MD deck) not only can ignore the SCMS copy-protect bit—when set to do so—but also will not propagate it. I tested this and I was, for example, able to copy a protected MD from the 930 to the E10, and vice-versa, once the E10 had stripped the SCMS.  Sony does not mention this feature in the E10's manual, at least not in the version I have. The E10 is Type R. I don't know if this applies to other decks in the E-series.