yes, but a major part of the reason that it is illegal to eavesdrop on them is because they are encrypted.
Generally speaking, it is not illegal to eavesdrop on unencrypted radio transmissions, but it is illegal to eavesdrop on any encrypted radio transmission (regardless of how effective the encryption is). This is because the people who crafted the law thought that an encrypted datastream was enough of a warning to potential eavesdroppers that the datastream is intended to be private. The crime isn't breaking the encryption, but violating a reasonable assumption of privacy.
The examples I cited all broadcast unencrypted datastreams, which is why it's legal to tune into them regardless of whether you are the intended recipient.
