ezPDFSecureReader is a dedicated PDF viewer for Android devices that allows you to view PDF documents with security features. This app is designed to open PDF files with password protection, watermarks, and other security measures. It is a free app developed by Unidocs Inc. that can be downloaded from the Google Play Store.

The app has an intuitive interface that makes it easy to use. It allows you to open PDF files from your device's storage or cloud storage services like Google Drive, Dropbox, and OneDrive. Once you open a PDF file, you can view it in different modes, such as fit to width, fit to height, and fit to screen. You can also zoom in and out of the document, add bookmarks, and navigate through pages quickly. The app supports various types of PDF annotations, including text boxes, sticky notes, and highlighters. Moreover, it allows you to fill out PDF forms and sign documents digitally.