Dumping Your own L3 CDM with Android Studio

[magicdl]

I tried with udemy but not working. I have PSSH and License url.
PSSH: AAAAMnBzc2gAAAAA7e+LqXnWSs6jyCfc1R0h7QAAABISEDCAkN J2pkMpueHBPw2AlwI=
License URL: https://www.udemy.com/api-2.0/media-license-server/validate-auth-token?drm_type=widevi...lA4f4pQ-9oCghg

Error this:
C:\Users\admin\Desktop\WKS-Keys-main\wks-keys\pywidevine\L3\cdm\cdm.py:260: RuntimeWarning: Unexpected end-group tag: Not all data was converted
license.ParseFromString(base64.b64decode(license_b 64))
Traceback (most recent call last):
File "C:\Users\admin\Desktop\WKS-Keys-main\wks-keys\l3.py", line 25, in <module>
correct, keys = WV_Function(pssh, lic_url)
File "C:\Users\admin\Desktop\WKS-Keys-main\wks-keys\l3.py", line 21, in WV_Function
wvdecrypt.update_license(license_b64)
File "C:\Users\admin\Desktop\WKS-Keys-main\wks-keys\pywidevine\L3\decrypt\wvdecryptcustom.py", line 58, in update_license
self.cdm.provide_license(self.session, license_b64)
File "C:\Users\admin\Desktop\WKS-Keys-main\wks-keys\pywidevine\L3\cdm\cdm.py", line 275, in provide_license
session.session_key = oaep_cipher.decrypt(license.SessionKey)
File "C:\Users\admin\AppData\Local\Programs\Python\Pyth on310\lib\site-packages\Cryptodome\Cipher\PKCS1_OAEP.py", line 167, in decrypt
raise ValueError("Ciphertext with incorrect length.")
ValueError: Ciphertext with incorrect length.

Any can help me.

[codehound]

1. udemy will not work with basic wks-keys there are extra parameters to consider
2. this is an android studio thread, and I would say that any cdm gained thru android emulator will never work with vdocipher

PS No I dont help course sellers either by PM here or DM on discord

[magicdl]

1. udemy will not work with basic wks-keys there are extra parameters to consider
2. this is an android studio thread, and I would say that any cdm gained thru android emulator will never work with vdocipher

PS No I dont help course sellers either by PM here or DM on discord

I just want to download a few courses.. My account is only valid for 1 week so I want to save them for study. sorry if you feel uncomfortable about this.

[ringy9]

Hi I'm following the guide for downloading Android Studio.
When I get to the command prompt: pip install Frida it downloads and installs the version below
- Downloading frida-16.0.11-cp37-abi3-win_amd64.whl (30.7 MB)

When I go to https://github.com/frida/frida/releases I'm confused as to which is the correct Frida Server for Android. The first release at the top is nearly but not quite the same as the one I downloaded with the command prompt. https://github.com/frida/frida/releases/download/16.0.11/frida-16.0.11-cp37-abi3-freeb...ease_amd64.whl
I am working on a Windows 11 64 bit Desktop if that makes any difference?

Any Guidance would be appreciated.

[cedric8528]

You choose the wrong version.

You need Frida-Server

https://github.com/frida/frida/releases/download/16.0.11/frida-server-16.0.11-android-x86.xz

[ringy9]

You choose the wrong version.

You need Frida-Server

https://github.com/frida/frida/releases/download/16.0.11/frida-server-16.0.11-android-x86.xz

Thank You cedric8528 for pointing me in the right direction

[Karn]

Does emulator cdm work with vdocipher? Many were saying they were unsuccessful in retrieving keys.

[cedric8528]

Look at previous post from Codehound #92

[Karn]

Look at previous post from Codehound #92

Missed that somehow. Got it, thanks.

[ringy9]

Hi everyone, After finally managing to download the Android-Server (thanks Cedric8528) I'm having trouble with the command to upload to the virtual device

https://files.videohelp.com/u/305113/Screenshot%202023-03-20%20115815.png

Would it be correct that on a Windows 11 Desktop that the files for the virtual device are in Sdk\Emulator ? every path I have tried seems to fail.

Thanks

(Edit) Yes I know I pasted the wrong cmd command into the Picture with 2X C:Users\User\

[ElCap]

Hi everyone, After finally managing to download the Android-Server (thanks Cedric8528) I'm having trouble with the command to upload to the virtual device

https://files.videohelp.com/u/305113/Screenshot%202023-03-20%20115815.png

Would it be correct that on a Windows 11 Desktop that the files for the virtual device are in Sdk\Emulator ? every path I have tried seems to fail.

Thanks

(Edit) Yes I know I pasted the wrong cmd command into the Picture with 2X C:Users\User\

follow the instructions from the first post

adb.exe push frida-server-16.0.2-android-x86 /sdcard

[ringy9]

Thanks for your reply and patience ElCap. I am following the first post and when I get to this part I get a computer error saying this App cannot be opened on your PC and in the command line it states Access is denied. If I am doing this completely wrong then please enlighten me with the correct process.

Thanks again

[ElCap]

Do you have a screenshot of your command and the error?

[ringy9]

This is what I'm getting ElCap
https://files.videohelp.com/u/305113/Error%20cmd.png

https://files.videohelp.com/u/305113/Error.png

[ElCap]

move the frida-server file to the same folder as adb.exe
then change to that directory and run the same command as the first post.

if that doesnt work, do
"adb devices"
and
"adb shell"

[ringy9]

Thanks ElCap both the adb.exe and the frida-server are in the platform-tools folder.

When I first downloaded Android studio and created the virtual device and later went into the command line and performed the code I got a positive result the same as the one in the tutorial for pixel 6. Now when I open Android Studio I get this error message
https://files.videohelp.com/u/305113/Android%20Studio.png
and the command line has the same errors as before

[ElCap]

you could try deleting the virtual device and starting again - though you might need to delete the device files as well and redownload the image.
or try with a slightly different android version

[ringy9]

Ok Thanks ElCap I will try that

[solalparis]

This is what I'm getting ElCap
https://files.videohelp.com/u/305113/Error%20cmd.png

https://files.videohelp.com/u/305113/Error.png

This looks more like a windows feature to prevent you from using arbitrary apps downloaded from internet (in your case, the app is adb), you could try one of these solutions:

https://www.guidingtech.com/fix-this-app-cant-run-on-your-pc-error-in-windows-11/
https://answers.microsoft.com/en-us/windows/forum/all/cmd-access-denied/6abf6f0a-e7d1-...4-138831ceb538

[ringy9]

This is what I'm getting ElCap
https://files.videohelp.com/u/305113/Error%20cmd.png

https://files.videohelp.com/u/305113/Error.png

This looks more like a windows feature to prevent you from using arbitrary apps downloaded from internet (in your case, the app is adb), you could try one of these solutions:

https://www.guidingtech.com/fix-this-app-cant-run-on-your-pc-error-in-windows-11/
https://answers.microsoft.com/en-us/windows/forum/all/cmd-access-denied/6abf6f0a-e7d1-...4-138831ceb538

Thanks for those links solaparis2684733 when opening the command prompt as administrator and using the command adb.exe devices I see emulator-5554 devices

When I try the adb.exe push command I get the following error adb: error: cannot stat 'frida-server-16.0.11-android-x86': No such file or directory
https://files.videohelp.com/u/305113/ADB%20Error.png
I'm not seeing the app can't run on your PC error but I did a reinstall Android Studio as was first suggested

[ElCap]

When I try the adb.exe push command I get the following error adb: error: cannot stat 'frida-server-16.0.11-android-x86': No such file or directory

on your pc, what folder is "frida-server-16.0.11-android-x86" in?



go back to this section of the first post and where it says "put yourself in the right directory" in your cmd window type

cd C:\Users\User\AppData\Local\Android\Sdk\platform-tools\

then run "adb.exe devices" etc

[ringy9]

When I try the adb.exe push command I get the following error adb: error: cannot stat 'frida-server-16.0.11-android-x86': No such file or directory

on your pc, what folder is this file in "frida-server-16.0.11-android-x86"?

Users\User\AppData\Local\Android\Sdk\platform-tools
both are in the platform-tools folder adb.exe was there after installation and frida-server I put in there after unzipping

[ElCap]

look at my edit above.

in the cmd window, you need to change directory to that folder and then run the commands from there

[ringy9]

look at my edit above.

in the cmd window, you need to change directory to that folder and then run the commands from there

ElCap and others who have made suggestions thank you very much. Being a complete NOOB to this command line stuff I had no idea what the cd even meant or how to change a directory. As soon as that happened Stars started twinkling from my monitor

Now I just need to continue with the tutorial and see how I go.

Thanks a million

[ringy9]

Hi Again I'm guessing you knew I'd be back pretty quickly, when trying to run dump_keys.py I get the following error

https://files.videohelp.com/u/305113/Dumper%20Error.png

Now I have read in the thread of similar issues but not exactly the same? Or not that I can tell

[ElCap]

pip install protobuf==3.20.3

[ringy9]

pip install protobuf==3.20.3

So downgrade from 4.22.1?

[ElCap]

yep, thats what the error says to do and its a common issue

[HomeStarRunnerTron]

Just wanted to mention to anyone who might find this who's an M1 Mac user-- I don't think there's a way for M1 Macs to properly do this tutorial, due to an inability of accessing the x86 version of Android. The ARM Google APIs version of Android currently does not have Chrome, and isn't capable of correctly running Widevine on the built-in WebTest browser. Maybe in the future, it'll work. I got a friend with a 64-bit Linux computer to do this. It was capable of running the exact x86 version of Android Pie with Chrome in it, and everything worked just as said!

[shellcmd]

Just wanted to mention to anyone who might find this who's an M1 Mac user-- I don't think there's a way for M1 Macs to properly do this tutorial, due to an inability of accessing the x86 version of Android. The ARM Google APIs version of Android currently does not have Chrome, and isn't capable of correctly running Widevine on the built-in WebTest browser. Maybe in the future, it'll work. I got a friend with a 64-bit Linux computer to do this. It was capable of running the exact x86 version of Android Pie with Chrome in it, and everything worked just as said!

on your emulator android device , also have not Firefox or other browsers?



i have a confused question , in this thread used a "pixel 6"as example, it is with an "arm64" based on cpu ,but we choose "x86" system image to build this android device. i dont know why, if it depends on our pc's cpu ,but why x86 not x86_64?

by the way , i had successfully gained one key from Android Studio and some keys from real android devices. just a little confused.