"A senior defense official who was not authorized to speak"
I don't care what type of transport they are using, it is ridiculous to send it unencrypted.
It is entirely too inexpensive and simple to encrypt feeds.
The truth is, if something is broadcast over the air, it become publicly accessible, and it is up to the originator to secure it from undesired interpretation. Simply put, if one broadcasts anything, from WiFi, cordless phones, baby monitors, nannycams/porchcams etc, even and especially pay services, secure it or dont bitch if someone sees/hears/uses it. If your security is broken, FIX it. Dont depend on legislation to protect you. Reception of virtually any signal is nearly as easy as falling off a log. The ability to interpret it varies from no effort (free) to impossible (secured) and it's all fair game because it is literally in the air.