I don't know about now, but in a former life when I ran an ISP it was the norm for one-way satellite data to be completely unencrypted. Anyone who can 'see' the sat can receive and analyse any packets they want.
You might want to check this out if you are concerned about privacy, or security.
Another side effect of unencrypted sat communications - someone with a basic dialup modem account could hook up their sat receiver and get a 6-10Mbps connection for about $US20 a month. This is because data headed for their modem IP went via the (broadband) sat, so instead of taking the data through a choked 33.6k modem, they got it through the ethernet port of their sat receiver. At that time the wholesale value of 10Mbps was tens of thousands of dollars.
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