Amazon Kindle
Calibre is a freeware which can help you convert eBooks between common formats. With plugin installed, it can help you remove DRM protection from eBooks on Amazon Kindle.
Step 1: Download and install Calibre for your OS.
Step 2: Download the latest Combined Tools package and unzip it.
Step 3: Run Calibre. Click Preferences. Click Plugins.

Step 4: Click on the large "Add a new plugin" button.

For the remaining steps, see eBook DRM Remover.
Nook
ePub DRM Removal Software can remove DRM protection from eBooks of Nook ePub files. Download it and follow the steps for removing DRM protection from eBooks step by step.
Step 1: Install Adobe Flash Player. (http://get.adobe.com/flash player/)
Step 2: Install Adobe Digital Editions. (http://www.adobe.com/products/digital editions) Authorize your copy of Adobe Digital Editions.
Step 3: Install ePub DRM Removal software. Run ePub DRM Removal software to remove DRM from ePub. A dialog windows will pop up :

Step 4: Input files by clicking the "Browse" button to choose your ePub eBooks. Click "unDRM directory", then remove DRM from ePub files fast.
If your Nook eBook is PDF format, try PDF DRM Removal.
Google Books
If your Google books are PDF files and are DRM protected, you can try PDF DRM Removal software to remove DRM protection from eBooks of Google. Following are the detailed steps for removing DRM protection from eBooks.
Step 1: Install PDF DRM Removal and then run PDF DRM Removal to remove DRM from PDF. A dialog windows will pop up:

Step 2: Input files by clicking on the "Browse" button to choose your PDF ebook / input folder.
Step 3: Click "unDRM directory", then remove DRM from PDF files.
Adobe Store
The books downloaded from Adobe store are ePub format, so to remove DRM protection from eBooks of ePub, try the ePub DRM removal software.
iBookstore
Currently, the iBooks ePub DRM has not be jailbroken yet.
Tags: removing drm protection from ebooks, remove ebooks drm protection, remove drm protection from ebooks
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