Removing DRM move azw3 between Kindle

I don't want pirate or pirated copy books.

But I do have two different Kindle account in 2 different country.

Want read all the books on my Kindle paperwhite, here is how:

Using Calibre

Go to http://apprenticealf.wordpress.com and download the newest version of the DeDRM tools from one of the links given there. You should wind up with a file called tools_v6.0.8.zip.

Unzip it to produce the directory tools_v6.0.8.

Inside that directory are three sub-directories: Calibre_Plugins, DeDRM_Applications, and Other_Tools, which seemsreasonably obvious.

The DRM encryption scheme incorporates the serial number of the device it was downloaded to, so write down the serial number(s) of your book reader(s) because you’re going to need them.

On an e-ink Kindle, the serial number is at Menu-->Settings under the "Device Info" heading.

To install the Calibre plugin, start Calibre-->Preferences-->Plugins-->Load Plugin From File. Navigate to tools_v6.0.8/DeDRM_calibre_plugin and select DeDRM_plugin.zip. Ignore the warnings.

Back out and select Calibre-->Preferences-->File Type Plugins.
Select the DeDRM plugin and click on "Customize plugin".
Enter the serial numbers of your Kindle devices, separated by commas.
Click “Apply”

Restart Calibre for the plugin to take effect.

The plugin will now remove DRM from any Kindle file being added to the Calibre library or being sent to the bookreader, but it will not change the version which is already in the Calibre database!

If you want to remove DRM from a book already in the Calibre database (to read it from inside Calibre, for instance), the easiest way is to select the book(s), click on “Save to Disk”, then import them (removing the DRM in the process) and delete the originals.

Reference:
http://apprenticealf.wordpress.com/
https://github.com/psyrendust/dedrm-ebook-tools/blob/master/DeDRM_Windows_Application/DeDRM_App/DeDRM_lib/lib/k4mobidedrm.py
http://www.prismnet.com/~dierdorf/jan13.html