No encryption*. I think they broadcast on S-band which isn't necessarily compatible with a $20 hobbyist rtl-sdr, but still possible with more advanced amateur setups
* Ok that's an oversimplification. They actually turn encryption on while the satellite is over certain areas. But if you're in the Continental US I think it's in the clear
* Ok that's an oversimplification. They actually turn encryption on while the satellite is over certain areas. But if you're in the Continental US I think it's in the clear