Protect your PES mods from unauthorized extraction with advanced multi-layer CPK encryption.
MODSLOCK Pro is a clean, open-source tool built with Python and PyQt6. It does not connect to the internet, collect data, or modify any system files. It only processes the files you choose.
Works 100% offline. No data is ever sent anywhere.
Only reads/writes the mod files you select. Nothing else.
Locked CPKs can always be unlocked with correct password.
Tested on PES 2017, 2018, 2019, and 2021 mods.
MODSLOCK Pro is a CPK encryption tool designed for PES modders who want to protect their work from being extracted and re-distributed without permission.
Use this when you have a mod folder (e.g. GM_WC26/common/...) that hasn't been packed to CPK yet.
Run ModsLock Pro.exe — no installation needed.
Drag the root folder of your mod into the drop area. The mode will show FOLDER.
Standard for normal use, Medium for stronger protection, Strong for maximum security.
Type a password (minimum 6 characters) and confirm it. Remember this password!
The tool will pack your folder into a CPK and encrypt it. You'll get two files:
| File | Purpose |
|---|---|
| YourMod_locked.cpk | The encrypted CPK — distribute this to users |
| YourMod_locked.cpk.lock | Key file — keep this private! Needed to unlock |
Already have a .cpk file? Just drag it instead. The mode will show CPK. The tool will encrypt it directly. Same steps apply.
Switch to the Unlock tab in the app.
Drop your _locked.cpk file into the area. Make sure the .lock file is in the same folder!
Type the exact password you used to lock.
You'll get a restored _unlocked.cpk file. Optionally check "Auto-extract" to extract files after unlock.
| Level | Strength | Recommended For |
|---|---|---|
| Standard | Basic encryption layer | Normal mod sharing |
| Medium | Enhanced encryption | Popular mods, paid content |
| Strong | Maximum encryption | High-value or exclusive mods |
All games using CPK archive format are supported. Locked CPKs work normally in-game — only extraction tools are blocked.
Remember your password! Without the correct password, there is no way to unlock your CPK. Write it down somewhere safe.
Keep the .lock file private! The .lock file is your key. Never share it publicly. Without it, nobody can unlock.
Keep .cpk and .lock together. Both files must be in the same folder when unlocking. If you lose the .lock file, unlocking is not possible.
Always keep a backup of your original files before locking. The "Keep original" option is enabled by default.
Yes! The game reads files by internal offsets, not by filenames. Your locked CPK works perfectly in-game.
No. Extraction tools like CriPakTools, CPK File Builder, etc. will fail to read the file structure correctly. Your mod data is protected.
No. This is a false positive — common with PyInstaller-built apps. The tool is 100% clean. It's built from open Python source code, does not access the internet, and does not modify system files. You can whitelist it safely.
Yes. Lock your paid/exclusive mods and only share the .cpk file. Keep the .lock file and password to yourself.