CAM is recorded in a theater by a hidden camera;
HDTC is High Definition Telecine (recorded from the booth itself, usually on a tripod, converted to digital (quality will still be deficient);
Asian Hard Sub means it was recorded at an ASian theater (probably Chinese), so it will include subtext that cannot be disabled;
Masks and snokes.. no idea (I think mask means that there may have been some annoying print on the screen that advertised the decoder/coder of the stolen film that was then masked/blurred over).
I co-worker of mine spent a few tours in Afghanistan and Iraq. He said that the black market in the Middle East is really something. Apparently you could get first run movies sometimes before they were in theaters in the US. He said the quality was terrible. But if you waited about 5 or 6 weeks, you could get high quality 1st run movies for only a few bucks.