Thanks for your response, Wook. I have davextreme’s “Mild Mannered Edition” Fleischer Superman shorts, which he used various DVD sources on in a manner that I assume is legal, but Criterion is a step above your average PD DVD label, so I wondered if they had copyrighted their transfer in some way. I assume they own their supplemental features, so those can’t be uploaded anywhere legally, but the movie itself I didn’t know anout. I’ll be interested to see if anyone tries it in the not too distant future.