Boomstream-dedrm

Boomstream video downloader. Works as plugin for chrome

Installation

Obtain chrome extension from release page
unzip archive
go to chrome extensions page chrome://extensions/ and activate Developer mode
next click load unpacked and choose a folder, where plugin was unpacked

Once installed, the plugin boomstream-dedrm will appear among other extensions
Click on the plugin. Once clicked, boomstream-dedrm plugin will inject special script on the active browser's tab, which will listen for boomstream requests.
The plugin will also inject the script to all other tabs for the same website
At the bottom of the web page (where script injected) you should see orange progress bar, which will tell download status
start playing the video and boomstream will start download progress
the plugin will download the playlist.m3u8 file with all injected params (IV, URI) and then video file in .ts format
in case video download fail, you always can download video by yourself by using playlist.m3u8 file and youtube-downloader util (or some other tool)

plugin consists of 2 parts: inject script and background script
when plugin is activated - the background script listens for http requests
Once background script detects request for .m3u8 - it will re-download this file and check if it's a playlist file. If so - this playlist then got cached
at the next step, script will listen for request with subpath /process/. This request should return the key for video decryption
After both requests (for obtaining playlist and key) were processed, the download process starts
During download, injected script on browser page, will start downloading chunks from the playlist file
Each chunk will then be decrypted and concatenated in one file
As chunks are in stream video format, the output file will be in .ts format

the ts format can be played in VLC media player
the ts format can be converted to mp4 format with ffmpeg tool ffmpeg -i "video.ts" "video.mp4"