Decrypting .gem file

Discussion & Solutions
1

I got a .gem file. Is there any way to convert that .gem file to .mp4 , coz it consists of video lectures. Please help me with this.

2

:unlocked: The Complete GEM File Situation

:world_map: One-Line Flow: You’ll go from “what even is this file” → knowing every possible way to crack it open.

Look, GEM files are ThunderSoft’s way of locking videos so you can’t just… have them. Indian coaching institutes (Made Easy, etc.) LOVE this format. The bad news? There’s no magic “GEM to MP4 converter” you can download. The good news? People have figured this out, and I’m about to save you weeks of searching.

🎯 FIRST: What Actually Works (Start Here)

The Playback Method (If You Have GATE/Made Easy Content)

Someone leaked the encryption keys for basically every Made Easy course. You won’t extract the MP4, but you CAN watch it on any computer:

Step 1: Download GemPlayer (official, free)

Step 2: Download Free DRM Protection (yes, the encryption tool - it also generates passwords)

Step 3: Open your .gem file in GemPlayer → copy the “Machine Code” it shows you

Step 4: In Free DRM Protection → click “Create Play Password” → paste your Machine Code + the encryption key from below → generate → paste into GemPlayer

Leaked Encryption Keys:

Course Key
CSE Live yL3@c*Q6xfjGz2TDhxbWCS01
CSE CTQ yL3@c*Q6xfjGz2TDhxbWCS02
Mechanical Full yL3@c*Q6xfjGz2TDhxbWME01
Mechanical CTQ yL3@c*Q6xfjGz2TDhxbWME02
Mechanical QRC yL3@c*Q6xfjGz2TDhxbWME03
ECE Live yL3@c*Q6xfjGz2TDhxbWEC01
ECE CTQ yL3@c*Q6xfjGz2TDhxbWEC02
Civil Engineering yL3@c*Q6xfjGz2TDhxbWCL01
Electrical CTQ yL3@c*Q6xfjGz2TDhxbWEE02
General ESE yL3@c*Q6xfjGz2TDhxbWGS01
Generic/Other yL3@c*Q6xfjGz2TDhxbW

Newer courses use “ndf” suffix - just add ndf to the end:

  • yL3@c*Q6xfjGz2TDhxbWCS01ndf (CSE Live new)
  • yL3@c*Q6xfjGz2TDhxbWME01ndf (Mechanical new)
  • etc.

:warning: Reality check: This lets you WATCH the video. It doesn’t extract MP4. But hey, you can now study on any PC.

🎬 The August 2025 Tutorial (Most Promising Lead)

Someone dropped a video in August 2025 claiming they can decrypt GEM files without needing the password at all. Version 5 of their method.

Watch it here:

The video title says “without needing a password or license key” - if that’s real, it’s the holy grail. The uploader hasn’t made their tool public anywhere I could find, but the video itself might show you how.

Worth watching. Report back if you find a download link in the description.

đź’° The Paid Service Route (Confirmed Working)

A user called tombrox on VideoHelp has a private decryption tool. He’s demonstrated it works - decrypted a sample file someone uploaded.

His exact words:

“To decrypt, you need to write your own decryption tool, for which you need knowledge of reverse engineering, assembly language, and the ability to use tools such as IDA, x64dbg… Unfortunately, my tool is private and cannot be published. If necessary, I can decrypt your files. Of course, it is not free.”

Where to find him:

If you’ve got important content you absolutely need extracted, this is probably your most reliable path. DM him on the forum.

🕵️ The Gatekept Tools (They Exist, Nobody's Sharing)

Here’s the frustrating truth I found digging through RE forums:

RevTeam.re - Someone named H1ghl4nd3r literally said “Yes there is an app to decrypt” then refused to share because the thread creator had “bad attitude.” Classic.

VideoHelp - Multiple users confirm extractions have happened:

“These types of files have already been decrypted, and the MP4 file has been extracted from the GEM file. This means someone has the knowledge, but it hasn’t been made public yet.”

52pojie.cn (Chinese RE forum) - Only found cracked versions of the DRM Protection encryptor. Nobody’s posted a decryptor.

The tools exist. People are just… not sharing them. Gotta love the RE community sometimes.

🖥️ Screen Recording Bypass (Last Resort)

GemPlayer has anti-screen-capture built in. Most recorders just capture black video. BUT:

Things people have tried:

  • Disable hardware acceleration in both GemPlayer AND your recorder (OBS)
  • Use display capture instead of window capture
  • HDMI capture card (hardware bypass - always works but you need the hardware)
  • Some claim EaseUS RecExperts or iTop Screen Recorder bypass it

Reality: Hit or miss. The newer GemPlayer versions (5.x) specifically added “Prevent screen recording” in the changelog. Your mileage will vary.

🔧 The Technical Path (For Actual RE People)

If you actually know reverse engineering, here’s what you’re working with:

The Setup:

  • GEM uses AES encryption
  • Key protection is 1024-bit RSA
  • Machine ID binding (hardware lock)
  • Player binary: CPPlayer.exe

Attack Surface:

  • Hook AES decryption in CPPlayer.exe using Frida or x64dbg
  • Dump decrypted stream before it hits the video renderer
  • User foxengine on VideoHelp: “i success to crack and can stop machine code that gem file will work via any license but cannot extract video”
  • User first.last99j: “after extraction we have to use aes decryption with 20 length key to get the exact video file”

Frida AES Hook Resources:

You’d need to adapt these for Windows native apps instead of Android.

Why nobody’s released a tool: It requires actual skill, and anyone who figures it out either sells the service or keeps it private. Welcome to niche DRM.

đź“š All Research Sources

Forum Threads:

Official Docs:

Tools:

Chinese Forum:

The Honest Summary

Method Extracts MP4? Difficulty Cost
Encryption keys + password gen :cross_mark: (playback only) Easy Free
V5 Odysee tutorial Maybe? Unknown Free
tombrox service :white_check_mark: Easy Paid
Screen recording :cross_mark: (capture only) Medium Free
RE/Frida hook :white_check_mark: Expert Free

My recommendation: Try the encryption keys first. If that doesn’t work for your content, watch the Odysee V5 video. If you’re desperate, hit up tombrox for paid decryption.

Nobody’s released a public “GEM Decryptor v1.0” and probably won’t - it’s too niche and anyone who cracks it just sells the service instead.

Good luck. Drop what you find back here. :saluting_face: