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.
I was using the E10 earlier tonight. It's set to ignore SCMS and does so reliably. Most or even perhaps all of the E-series decks can do that...E12 users also report success. I have the US model. BearBoy, if you want to let that Tapehead person know HowTo, it's just this: Setup Menu > Copy Bit > [Permit]. That setting is deep into the menu.
"...maybe not enforced in any J MD model?" If J = Japan, then yes, enforced, as on my JPN MXD-D400.
IIRC, the E10 actually strips SCMS, not j