No dumb questions here ... that's in the by-laws.
Deep Cameo (DCAM) is a term applied to proofs and Deep-Mirror Proof-Like (DMPL) is applied to circulation strikes. It is a simple as black and white. The devices (lettering, profiles, eagles, etc.) have a satin finish and do not reflect light the same as the mirrored fields. If you hold a DCAM coin at an angle to the light source, the devices will shine white from all angles and the fields will only reflect light to your eye at one angle. So when viewed with the light not reflecting into your eye, the fields appear almost black and the devices almost pure white. This contrast is highly desired in proofs and only comes from the first coins off new dies. As the dies wear the satin finish on the devices wears smooth and the reflective properties are more like those of the fields.
Nothing beats a picture to better 'splain things. Here are two DCAM coins (one silver and one gold). Note the dramatic contrast between the fields and the devices. Hope this helps.