Simple program to download a Udemy course, has support for DRM videos but requires the user to aquire the decryption key (for legal reasons).
Current only Windows is supported but with some small modifications it should work on linux also (and maybe mac)

Requirements

You would need to download ffmpeg and mp4decrypterfrom Bento4 SDK and ensure they are in path (typing their name in cmd invokes them).

Usage

quick and dirty how-to

You will need to get a few things before you can use this program:

Decryption Key ID
Decryption Key
Udemy Course URL
Udemy Bearer Token

Setting up

rename .env.sample to .env (you only need to do this if you plan to use the .env file to store your bearer token)
rename keyfile.example.json to keyfile.json

Aquire bearer token

open dev tools
go to network tab
in the search field, enter api-2.0/courses
click a random request
locate the Request Headers section
copy the the text after Authorization, it should look like Bearer xxxxxxxxxxx
enter this in the .env file after UDEMY_BEARER= (you can also pass this as an argument, see advanced usage for more information)

Key ID and Key

It is up to you to aquire the key and key id. Please don't ask me for help acquiring these, decrypting DRM protected content can be considered piracy.

Enter the key and key id in the keyfile.json

Start Downloading

You can now run python main.py to start downloading. The course will download to out_dir, chapters are seperated into folders.

Advanced Usage

usage: main.py [-h] -c COURSE_URL [-b BEARER_TOKEN] [-q QUALITY] [-l LANG] [--skip-lectures] [--download-assets] [--download-captions]
               [--keep-vtt] [--skip-hls]

Udemy Downloader

optional arguments:
  -h, --help            show this help message and exit
  -c COURSE_URL, --course-url COURSE_URL
                        The URL of the course to download
  -b BEARER_TOKEN, --bearer BEARER_TOKEN
                        The Bearer token to use
  -q QUALITY, --quality QUALITY
                        Download specific video quality. If the requested quality isn't available, the closest quality will be used. If not
                        specified, the best quality will be downloaded for each lecture
  -l LANG, --lang LANG  The language to download for captions, specify 'all' to download all captions (Default is 'en')
  --skip-lectures       If specified, lectures won't be downloaded
  --download-assets     If specified, lecture assets will be downloaded
  --download-captions   If specified, captions will be downloaded
  --keep-vtt            If specified, .vtt files won't be removed
  --skip-hls            If specified, hls streams will be skipped (faster fetching) (hls streams usually contain 1080p quality for non-drm
                        lectures)

Passing a Bearer Token and Course ID as an argument
- python main.py -c <Course URL> -b <Bearer Token>
- python main.py -c https://www.udemy.com/courses/myawesomecourse -b <Bearer Token>
Download a specific quality
- python main.py -c <Course URL> -q 720
Download assets along with lectures
- python main.py -c <Course URL> --download-assets
Download assets and specify a quality
- python main.py -c <Course URL> -q 360 --download-assets
Download captions (Defaults to English)
- python main.py -c <Course URL> --download-captions
Download captions with specific language
- python main.py -c <Course URL> --download-captions -l en - English subtitles
- python main.py -c <Course URL> --download-captions -l es - Spanish subtitles
- python main.py -c <Course URL> --download-captions -l it - Italian subtitles
- python main.py -c <Course URL> --download-captions -l pl - Polish Subtitles
- python main.py -c <Course URL> --download-captions -l all - Downloads all subtitles
- etc
Skip downloading lecture videos
- python main.py -c <Course URL> --skip-lectures --download-captions - Downloads only captions
- python main.py -c <Course URL> --skip-lectures --download-assets - Downloads only assets
Keep .VTT caption files:
- python main.py -c <Course URL> --download-captions --keep-vtt
Skip parsing HLS Streams (HLS streams usually contain 1080p quality for Non-DRM lectures):
- python main.py -c <Course URL> --skip-hls

Credits

https://github.com/Jayapraveen/Drm-Dash-stream-downloader - For the original code which this is based on
https://github.com/alastairmccormack/pywvpssh - For code related to PSSH extraction
https://github.com/alastairmccormack/pymp4parse - For code related to mp4 box parsing (used by pywvpssh)
https://github.com/lbrayner/vtt-to-srt - For code related to converting subtitles from vtt to srt format
https://github.com/r0oth3x49/udemy-dl - For some of the informaton related to using the udemy api