.........And the Baofeng 888, they have a speech inversion scrambler. Where can you use the scrambler on? FRS? The business bands?
No (FRS) and m-a-y-b-e on commercial or public safety. Oh, yeah, public safety can use type accepted radios with encryption protocols. But, the key is in type acceptance of the radios. Are Bow Fang's creations type accepted by the FCC's OET for Part 90? I'm not sufficiently motivated to look it up, but you might be....
Part 90 licensee can utilize encryption and there is no limitation on the type (AES, DES, ADP, DVP, rolling code, etc...). As long as the emission designator defines the modulation mask and they identify correctly they are good to go. It is not just limited to Public Safety. In Part 95 though the FCC is very clear that there is to be no encryption at anytime.
§ 90.212 Provisions relating to the use
of scrambling devices and digital
(a) Analog scrambling techniques
may be employed at any station authorized
the use of A3E, F3E, or G3E
emission, subject to the provision of
paragraph (d) of this section.
(b) The use of digital scrambling
techniques or digital voice modulation
requires the specific authorization of
F1E or G1E emission, and these emissions
will only be authorized subject to
the provisions of paragraph (d) of this
(c) The transmission of any non-voice
information or data under the authorization
of F1E or G1E emission is prohibited.
However, stations authorized
the use of F1E or G1E emission may
also be authorized F1D, F2D, G1D or
G2D emission for non-voice communication
purposes, pursuant to
(d) Station identification shall be
transmitted in the unscrambled analog
mode (clear voice) or Morse code in accordance
with the provisions of § 90.425.
All digital encoding and digital modulation
shall be disabled during station