It can be obfuscated with any Lua compiler but not encrypted to use in a single computer/account. But like HjugO said it's very risky.
I believe if Lucas add an encryption system in WindBot he could simply delete or don't let anyone encrypt codes with say("transfer 0 to X") and other stuff, but not like moving items via parcel. That would be impossible to detect if is the script doing some legal action or not. So there's come the risky thing.