Digital Rights Management (DRM) is a technology used to protect e-books from unauthorized access and distribution. DRM is implemented as a client-server system, where the client device (such as an e-book reader or a computer) requests access to the content, and the server validates the user's credentials and grants or denies access.

Here's an overview of how DRM technology works for e-books:

  1. Purchase. The user purchases an e-book from an online store that uses DRM technology to protect its content. During the purchase process, the user's device is authorized and receives a license key that is unique to that user and device.
  2. Download.The e-book is downloaded to the user's device. The e-book is encrypted using the license key that was obtained during the purchase process, so the user can't read it yet.
  3. Authentication. When the user wants to open the e-book, the e-book reader software on the device contacts the DRM server to authenticate the license key and obtain the decryption key.
  4. Decryption.If the authentication is successful, the DRM server sends the decryption key to the device. The device uses the key to decrypt the e-book and display its contents on the screen.

The above steps ensure that only authorized users can access the e-book, and it helps to prevent unauthorized distribution or copying of the content.