Kobo ebooks uses Adobe Digital Editions (ADE). So ebooks from Kobo use ADE DRM protection. Many other major ebook retailer use ePub format for ebooks. It is very easy to remove DRM (Digital Rights Management) protection from ePub ebooks using Adobe Digital Editions DRM protection, so you can free your ebooks and read them on any device that you have including but not limited to
Kindle,
Sony Reader,
Nook,...
You don't need to be a hacker to crack the encryption of DRM protected ePub files using ADE DRM. Just download freeware
ebook DRM removal tools archive including DRM removal tools for ePub files. And try to use
Calibre plug-ins first.