#6940
DRM (short for Digital Rights Management) is primarily utilized by developers, publishers, and copyright holders to manage the usage of digital contents and devices. It often implies copy protection or copy prevention, making it a popular choice for individuals aiming to prevent unauthorized duplication of important documents.

#2576
On many users' computer, it's probably that an EPUB (mobile-specific ebook format) reader is not installed at all. In that case, what we first think of is to convert it to the most commonly used and universal format for almost any device - PDF, therefore we still need some tool to help.