udemy-dl VS widevine-l3-guesser

If the course doesn't use DRM then https://github.com/r0oth3x49/udemy-dl otherwise https://github.com/Puyodead1/udemy-downloader and https://github.com/Satsuoni/widevine-l3-guesser with downgraded CDM to 2209 (might stop working on Udemy in the future though, but it still works for now)

udemy-dl is a good option (here I published the steps)

Ever since Udemy encrypted their videos, most downloader have died. Most Notably Udeler https://github.com/FaisalUmair/udemy-downloader-gui and Udemy-dl https://github.com/r0oth3x49/udemy-dl

or you can try https://github.com/r0oth3x49/udemy-dl

If they have DRM you need to find the keys using a Widevine Guesser, then download the encrypted file and decrypt it using either ffmpeg or mp4decrypt.

the widevinedumper script is a bit tricky, would be easier if you download the code for widevine-l3-guesser, open the content_key_decryption.js file, on line 106 you should see this, edit it with your own key, then add the extension to chrome

If the course doesn't use DRM then https://github.com/r0oth3x49/udemy-dl otherwise https://github.com/Puyodead1/udemy-downloader and https://github.com/Satsuoni/widevine-l3-guesser with downgraded CDM to 2209 (might stop working on Udemy in the future though, but it still works for now)

only downside is that you have to provide the decryption keys, the main way was using this extension https://github.com/Satsuoni/widevine-l3-guesser but google updated their DRM recently which broke it, not sure if it still works on udemy if you downgrade to the old CDM version or not.

> Is that even possible for Spotify at this point?

Spotify are using Widevine on their web client, which is considerably more annoying to deal with than the encryption method used in the files fetched by Psst.

Nothing is stopping them from only serving files from the endpoint that serves Widevine protected files.

Then again, Widevine L3 has been broken[0], Google just keeps rotating the private keys used in the content decryption module.

[0]: https://github.com/Satsuoni/widevine-l3-guesser

Fast forward to today and someone managed to find a way to brute force the Widevine keys again, on the latest version of chrome. You can find the new extension from here. If the GitHub repo gets taken down/dmca'd it is also saved in the Wayback Machine. The new extension brute forces the keys, so it will take around 15 minutes to get.

The widevine l3 guesser extension is linked here and also around the beginning of the post. You can download mp4decryptor from here. To install the extension, read the first tutorial (installing the extension.) To install mp4decryptor, you just need to extract the .zip you downloaded, then go into the extracted folder & into the bin folder, and then copy the "mp4decrypt.exe" file to the same folder with the encrypted mp4.