How to rip/download fakku subscription galleries

**************** [How to rip/download fakku subscription galleries] ****************
So I was having some fun checking out how well protected fakku subscriptions is against direct ripping / downloading of the images, mainly because I want to back everything up to re-read it later or offline / when my internet is too slow.

DISCLAIMER: I do NOT promote piracy. this is meant to be used for personal use and back-up of your fakku subscription doujins. redistributing them is illegal. get a fakku subscription. it's worth it.

TL;DR
- kill all chrome / chromium processes
- chromium-browser --disable-web-security
- open desired doujin on fakku subscriptions
- shift + ctrl + j
- document.getElementsByTagName('canvas')[1].toDataURL()
- press enter
- double click the base64 result
- save the image
- repeat for every page

Long explanation:
- by checking the cache, I can see that the reader retrieves scrambled images that are then unscrambled by the reader which is a 3k lines obfuscated javascript.
- the reader ultimately renders everything on a html5 canvas, so I immediately tried
document.getElementsByTagName('canvas')[1].toDataURL()
from the javascript console but it didn't work because of the CORS security stuff.
- restarted chromium with --disable-web-security
- toDataURL now works and I can simply open and save the base64 data url as an image.