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:
- 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.
- 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.
- 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.
- 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.