MagicLock vs PyArmor — Python encryption & licensing vs obfuscation
A factual comparison of MagicLock and PyArmor: bytecode obfuscation versus encryption with device-bound licensing, model protection, and a remote kill switch.
PyArmor is the best-known Python obfuscator, actively maintained for many years and widely used. It transforms your scripts into obfuscated bytecode, with machine binding and expiry available in its paid editions. If your goal is "make my Python hard to read" with a mature, well-documented tool, PyArmor is a reasonable choice — this page is about how the two approaches differ, not about talking you out of it.
What PyArmor does well
- A long track record and a large user base — it is the default name people reach for in Python obfuscation.
- Obfuscates scripts without code changes, with a range of hardening options (expired scripts, machine binding, restrict modes) in its paid editions.
- Pure-Python-workflow friendly: no compiler toolchain required.
The fundamental difference: obfuscation vs encryption
Obfuscation transforms the program but still delivers all of it. Whoever holds an obfuscated file holds the complete program logic, in executable form, on any machine — protection rests on the transformation staying expensive to reverse. With enough effort and tooling, obfuscated bytecode can, in principle, be reconstructed; PyArmor's own documentation is candid that obfuscation raises cost rather than making recovery impossible.
MagicLock encrypts. An artifact copied to a machine you haven't authorized doesn't present harder-to-read code — it presents ciphertext, and there is nothing to reverse without the per-device key. The question changes from "how hard is this to read?" to "is this machine allowed to run it at all?".
What MagicLock adds beyond obfuscation
| Capability | MagicLock | PyArmor |
|---|---|---|
| Core approach | Encryption + device-bound licensing | Bytecode obfuscation |
| Machine binding | Built in — every artifact, every tier | Available in paid editions |
| AI model / asset encryption | Per-device encrypted envelopes; plaintext only in memory | — |
| Remote kill switch after shipping | Opt-in --web-gate, per artifact | — |
| Native-code tier | magiclock build: license gate woven into every module, compiled to machine code | Obfuscated bytecode |
| Runs offline after activation | Yes — zero runtime network | Yes (bound scripts run locally) |
| Licensing portal for your customers' seats | Built in (activation, seats, artifact switches) | License files managed by you |
| CLI & portal languages | 6 (EN · 简体中文 · 繁體中文 · 日本語 · 한국어 · FR) | Varies |
Based on public documentation as of the date below; PyArmor editions differ — check pyarmor.readthedocs.io for current specifics.
When PyArmor may fit better
- You want a one-time-purchase, self-managed tool and are comfortable operating your own license files.
- Your threat model is casual reading, not determined extraction, and obfuscation's cost/benefit is enough.
When MagicLock fits better
- You are selling or licensing software and want who-can-run-it enforced by cryptography rather than transformation.
- You ship AI models or data that must never exist in plaintext on a customer's disk.
- You want the option to stop a shipped artifact remotely (unpaid invoice, expired pilot) — or the opposite guarantee, artifacts that are provably beyond anyone's remote reach.
- You want protection and licensing and native compilation from one command, with no license server to run.
Try the whole flow free for 48 hours — start here, or see how the protection works.
Facts last verified 2026-08
Product names and trademarks belong to their respective owners. Comparisons are based on public documentation; capabilities vary by version and edition — verify with each vendor for your use case.