Hello everyone! Hope all is good. I've spent the past few months scouring pages just to try and get decryption keys for widevine content. There was no clear instructions on the internet and the instructions that are there need pieced togther for a proper result. What I've tried to do is condense these fragments down to a cohesive guide for people to follow. If you have any questions feel free to message me on here, my reddit or discord, Contact informatoin can be found on my profile.
**IF YOU DO USE YOUR OWN ANDROID DEVICE YOU MUST INSTALL MAGISK AND THE FRIDA-SERVER MODULE**
You can find the installation instructions for magisk [here](https://topjohnwu.github.io/Magisk/install.html "here") and the frida module [here](https://github.com/ViRb3/magisk-frida "here").
**To enable ADB / USB Debugging follow these steps**
1. Open your device's Settings and tap About phone or About tablet.
2. Tap Build number repeatedly until you see a notification that reads "You are now a developer."
3. Go back to the main System menu, then tap Developer options.
4. Tap the toggle switch in the top-right corner to enable developer options (if it's not already enabled).
5. Tap OK to confirm.
6. Tap the USB debugging toggle switch.
7. Tap OK to confirm.
8. The next time you plug your device into a computer, you'll receive a prompt asking if you want to authorize USB debugging for that computer. Tap OK to confirm.
On your device you should receive a notificatoin to accept the adb connection, checkmark trust this device and then click allow.
**IF YOU HAVE MAGISK-FRIDA MODULE INSTALLED YOU MAY SKIP TO THE NEXT STEP**
Let's go ahead and push frida-server to the Android device, for the T95 S1 I used [Frida-Server 15.1.17](https://github.com/frida/frida/releases/download/15.1.17/frida-server-15.1.17-android-arm.xz "Frida-Server 15.1.17") for android. Unnzip the xz file and extract Frida-Server file.
You may get an error about chwon permission, this is negligible
Login as super user and clear any user environment variables active by including a hyphen after su `su -`
Give execute privileges to frida-server `chmod +x /data/local/tmp/fridaserver-15.1.17-android-arm`
Start the server ` /data/local/tmp/fridaserver-15.1.17-android-arm`
**When you start the server command prompt will hang, this is normal and means the program is running, do not close out and continue to step 2**
# Step 2: Extracting the CDM
*If you would like to check if frida-server is running connect via adb to your device in new command prompt like in step one, then use `adb shell` and then `su` and then ` ps | grep frida` this should show you the process running, if it does not something went wrong*
Download and extract [Dumper](https://cdm-project.com/cdm-tools/l3-dumper/-/archive/main/l3-dumper-main.zip "Dumper")
Open a new command prompt as administrator and change directories to the newly extracted folder and run `pip3 install -r requirements.txt` and once that's finished, start the program with ` python dump_keys.py`
Now play some widevine encrpyed content. I suggest using [https://bitmovin.com/demos/drm](https://bitmovin.com/demos/drm "https://bitmovin.com/demos/drm") playing over google chrome.
*Side note: on the T95 S1 I had to stop and start dumper a few times and rebooted the device a few times, sometimes it does take some effort for it to dump the keys*
Once you have played the content your keys should be dumped in the dumper folder under `/key-dumps/your-device-keys/xxxx/xxxxxxxx/` and should be named `client_id.bin` and `private_key.pem`
Make a copy of these for safekeeping wherever you like but DO NOT LOSE THEM
Make sure to have file extensions visible on windows, this can be turned on by searching "show file extensions" in the windows search bar.
Now we will rename these files, `clent_id.bin` to `device_client_id_blob.` and rename `private_key.pem` to `device_private_key.`**The periods on the end is intentional as windows likes to keep file extentions, please make sure to have this exact or it will cause errors with downey! Only rename with windows, using a program such as text editor and saving under all files will still corrupt the data!**
Open command prompt as adminstrator and navigate to extracted Downey folder.
Build Downey with command `go build -o downey.exe -a main.go` once this is finished you should see `downeye.exe` in your Downey folder
Copy the `device_client_id_blob` file and `device_private_key` file to the Downey folder.
Open Firefox or Chrome and navigate back to [https://bitmovin.com/demos/drm](https://bitmovin.com/demos/drm "https://bitmovin.com/demos/drm") and open web devoloper tools (ctrl+shift+c) and click on the network tab
Play the video on the site, then in the filter urls type in `method:POST` and under the domain look for the licensing server, in this case it's `https://cwip-shaka-proxy.appspot.com/` right click on this value and copy value -> copy post data and paste this somewhere safe for now.
Next we need the MPD file, under the filter url section in the network tab now we are going to filter for `MPD` one result should show up for `11331.mpd` downoad this by double clicking or copying and saving. Rename this file to `manifest.mpd`and place it in your Downey folder
Now we have everything we need, let's go ahead and run downey with `downey.exe --lic-server "https://cwip-shaka-proxy.appspot.com/no_auth"` if everything goes successful you should get the decryption keys for the video, so for bitmovin i received
