DRM Removal from eBooks: PDF files
Following are the step-by-step guide of how to remove DRM from eBooks of PDF files. The tool needed is a freeware ePUBee ( http://www.epubee.com ). Go ahead with DRM removal from eBook right now!
Step 1: Install
Download ADE here: http://www.adobe.com/products/digital editions
Authorize your copy of Adobe Digital Editions with you Personal ID. Install the software for DRM removal from eBooks.
Step 2: Run
Run the software . A dialog windows will pop up later:
Step 3: Input files.
Click on the "Input..." button to choose your PDF ebooks. Click "Remove DRM", then remove DRM from eBooks fast. That's all.

DRM Removal from eBooks: ePub files
Firstly, download Epubor ePub DRM Remover.
http://www.epubor.com/epub-drm-removal.html
Then follow the guide below for DRM removal from eBooks of ePub format files.
Step 1: Install
Download ADE: http://www.adobe.com/products/digitaleditions
the download page need Adobe Flash Player, http://get.adobe.com/flashplayer/
Step 2: Launch
Run this eBook DRM remover to remove DRM from eBook files.
Step 3: Input files
Click on the "Input..." button to choose your EPUB ebook / input folder. You'll find it in "My Documents\My Digital Editions". Click "Remove DRM ", then remove DRM from eBooks of Pub files all the folder.

Note: For mac users, there are some drm mac software to choose , such as drm removal mac, etc.