Re: backward compatibility NOT a thing with Micro-shaft
Memory can be hacked, and most drums don't have enough circumference to electrically store an entire page. Plus it's essentially a black box since you can't actually see this in action (the drum is photo-sensitive so can't be exposed to ambient light when in use).
As I recall, most secure laser printers aren't intended for copying but to produce legally-significant documents and things like checks which require special materials to protect against forgery.