Converting ADE protected ePub to kindle apps

Hi, I have bought ebooks from christianbook.com which I have downloaded using ADE to my pc.

Recently I am using kindle app for pc and also for iPad, not the hardware.

I have also use Calibre to convert most of my ePub.

Some which are protected but of course I am the authorised owner of the E-Books are not converted by Calibre.

I have read helps for kindle hardwares. Could someone please help me solving my conversion problem?

Thanks.

Raymond Seow