Can you use encryption on DMR legally? In ham or other frequencies? If so what license would one need?
Part 90 licensees can use encryption. P25 DES Encryption protocol must be used (90.553). The current ETSI DMR standards do not support encryption. If it's out there, it's proprietary. How it's legality within part 90 might work, I'm not really sure. It's probably simply a case of technology outpacing regulations, in which case one could assume that once ETSI standards are settled, it could be incorporated withing 90.553 - which in and of itself DOES allow encryption.
Part 90 licensees can use encryption. P25 DES Encryption protocol must be used (90.553). The current ETSI DMR standards do not support encryption. If it's out there, it's proprietary. How it's legality within part 90 might work, I'm not really sure. It's probably simply a case of technology outpacing regulations, in which case one could assume that once ETSI standards are settled, it could be incorporated within 90.553 - which in and of itself DOES allow encryption.
90.212 covers encryption on the rest of the PLM frequencies.
Ham freq's, no.Can you use encryption on DMR legally? In ham or other frequencies? If so what license would one need?
You didn't say where you were located, so I will give the information that I am aware of. In Canada, from what Industry Canada has said, it is legal to use encryption on the amateur frequencies as long as you use a key that is published. If you don't make the key available to everyone, you can't encrypt.
Interesting how Canada and the US are different on encryption in the ham bands. What's ironic, is that if the encryption key is publicly available to anyone/everyone, doesn't that negate the purpose of encryption? That's like putting a sign on your front door that says "Door is locked so that no one may enter. There is a spare key under the door mat. Come on in."
Since Amateur Radio is not designed to be a private means of communication, why would anyone need/want to use encryption in the ham bands, except for experimentation? No answer needed, that was a rhetorical question, and one that has been beaten to death on here.