Just feel free to transfer them to anyone. If you can read your books on Calibre without restriction, they will be DRM free. DRM-protected PDFs will come with a similar alert window. Or you can open the PDF books with your favorite PDF reader. If the following warning window pops, it means that your book is DRM protected. Launch Calibre ( Windows/ Mac), add your ePUB & PDF books and double click the book title to open it. If you ensure your eBooks are protected with DRM, you can just skip over this step in case of wasting your time. Or if your books are rented from libraries, they are also protected by DRM. Note: Usually, if your books are purchased from online eBook vendors, they are protected by DRM. Check Whether Your Adobe PDF or Epub ebooks are DRM Protected or not Read Your DRM-protected ePUB & PDF eBooks on Adobe Digital Editions
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