The motivations vary widely:

Understanding why you need decryption is the first step toward a better solution.

A server owner decrypted a paid admin menu to "remove the watermark." He accidentally removed a TriggerEvent that cleaned up logs. The menu corrupted his database, wiping 3 months of player progress. No support – the developer refused to help because the license was voided.

Most commercial or custom FiveM scripts are not distributed as raw, readable Lua source code. Instead, developers apply obfuscation or encryption to protect intellectual property. The common layers include:

If you are a developer, proactive protection is better than reactive DMCA notices.

FiveM scripts are original software works protected by copyright. Circumventing a protection mechanism (encryption, obfuscation) violates 17 U.S. Code § 1201 (Anti-Circumvention). Penalties range from $2,500 to $25,000 per violation plus potential jail time for commercial infringement.

Even if you bought the script, decrypting it is generally not considered "fair use" unless for interoperability or security research – and even then, you must prove good faith.