Stop shipping plaintext. FiveSecured encrypts, obfuscates, and licenses your Lua resources so customers run your work without ever holding your source.
I'd go so far as to say:
1. Modding is supposed to be something you do out of passion and not for monetary benefit.
2. If you ARE doing it for monetary benefit, and you then cry about people not respecting rules and legality of distribution by leaking those packs, okay, let's talk the legality of distribution then: Why do you think Rockstar goes through the trouble of putting fictional vehicles into the game so that we have to install mods? Because they don't have the capacity or the budget to license real-life vehicles. You want to talk legality? Let's talk legality. Do YOU, the mod author, pay royalties to Ford/Chevy/Dodge for these mods? If not, stop complaining about the legality of distribution that you get to cherrypick and decide. If these companies want, they can steamroll you over within 24 hours, along with Rockstar for modding their vehicles in game without license. So if they don't mind overlooking your disrespect for legality of the issue, pay it forward. OR play by the rules and shut down your illegal business. You don't get to pick and choose.