Well, the data isn't coded in a way that it's used for encryption and it would not aid nor hinder unauthorized access or misuse to this particular system. In addition, these unit numbers are public information and proudly emblazoned on the exterior of most patrol units.
As a radio tech I fully realize that the voice and data repeater systems I set up are monitorable by others and that doesn't bother me. As a user of a radio system, I also believe people should also be aware of that. MDC1200 is just yet another signalling standard, not unlike FleetSync, G-STAR, DTMF and single/multi-frequency signalling - yet we share fire page tones on public internet webpages and forums alike. Heck, what about decoding CTCSS/DCS and sharing those sub-tones? They may be simpler signalling systems, but still used for such purposes nonetheless.
In any case... my participation on here is mostly to try and connect with others also monitoring radio communication systems to share knowledge and advance the hobby. For me it is also a profession and it is interesting to see how other systems are designed and configured for each particular customer's application and needs. I've been involved with projects for several smaller fire department radio systems (yes, typically migrating from conventional FM voice to TRBO/DMR) and I've seen multiple ways that radio unit signalling can be set up and brought back to either manual or automated dispatch systems for anything from basic identification of transmissions, to a user pressing the emergency button on their radio, to automated "man-down" notification triggered by the built in sensors in the newer portables. I'll just say there's quite the plethora of systems running out at EOCs such as Parkland County 911.
For the most part I lurk these forums just to "read the mail" and I'm not all too active on the posting, and I realize I never did make a formal introduction to the members here.
As you would expect, I deal with Industry Canada's Spectrum Management team as part of my work, and they're aware of me... if there's a problem they know how to get a hold of me and I'll be happy to comply. Or, if there's a problem with the rules around here I'd be happy to comply as well. Again - just looking to connect with others who may have common interests on here. I've been on the flip side... troubleshooting problems caused by unauthorized users of radio equipment or poorly maintained equipment - and I know first hand the impact that can have on mission critical systems.