Only every company I have heard of that was developing a G4 detector that sit on the control panel data BUS was risco, but this was when the Grading first came out. Iam glad they didnt make one would have been a joke.
Worked in a few banks where they have PACOM panels, and the detectors are still 1980s C+K dualtecs which must be wired EOL as they wont have any sort of data bus between the two.
Encrypted protocol wont happen in this country, unless a manufacturer who makes both panels and detectors does it, Thorn had encrypted RIOs for Galaxy think that the nearest anybody has got to it.