How do you encrypt scripts for online sale?

You need to be realistic about the level of protection you can get. You can make it awkward for a casual user to get the lines of the script. This is commonly called "obfuscation" and there are a number of approaches. You can't stop it being examined by someone with suitable tools, and you can't keep it from being shared. Do NOT include secrets (like passwords to web sites) in the code.

[ moved from InDesign to Illustrator forum ]

You could add a layer of obfuscation over jsxbin to make the code a bit more secure. One such utility is jsxblind. Check out the details at the following

https://indiscripts.com/post/2015/12/jsxblind-first-jsxbin-obfuscator-for-extendscript

-Manan

Jsxbin is only a basic way to obscure the code - it can be easily converted back to jsx / plain text. 

Hello @dane13860245,

Export your .jsx file as a "Binary" .jsxbin file

Regards,

Mike