> For the complete documentation index, see [llms.txt](https://docs.apryse.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.apryse.com/android/security.md). # Security - [Securing PDFs with Android library](https://docs.apryse.com/android/security/security.md): Learn how to secure and read documents with encryption using PDFSecure, a command-line tool for adding password protection and adjusting permissions on PDFs. Find out more in our related blog on how t - [Encrypting & securing PDFs in Android](https://docs.apryse.com/android/security/encrypt.md): Secure PDF documents with password protection and permissions using Apryse SDK. Learn about encryption support and custom security handlers for enhanced document security. Get started now! The Apryse - [Decrypt & read a PDF document in Android](https://docs.apryse.com/android/security/decrypt.md): Guide to read a PDF document with password protection. - [Apryse Custom Security Handler in Android](https://docs.apryse.com/android/security/custom-handler.md): Secure your files with the Apryse Custom Security Handler. Learn how to encrypt and decrypt documents for Digital Rights Management (DRM) use cases. Simplify encryption with Apryse SDK. The Apryse And - [Code samples to secure PDFs via encryption / decryption in Android](https://docs.apryse.com/android/security/samples.md): Learn how to Encrypt and Decrypt PDF Files with PDFNet SDK. Explore encryption support, sample code, and UI samples in this showcase app. Discover how to secure your documents with password protection - [APIs for securing PDFs in Android](https://docs.apryse.com/android/security/apis.md): Enhance PDF document security with utility classes in Android using com.pdftron.sdf.SecurityHandler. Learn how to protect your files effectively. The Apryse Android SDK streamlines secure document pro --- # Agent Instructions This documentation is published with GitBook. GitBook is the documentation platform designed so that both humans and AI agents can read, navigate, and reason over technical content effectively. Learn more at gitbook.com. ## Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation by asking a question. Perform an HTTP GET request on the following URL with the `ask` and `goal` query parameters: ``` GET https://docs.apryse.com/android/security.md?ask=&goal= ``` `ask` is the immediate question: it should be specific, self-contained, and written in natural language. `goal` is what the user is ultimately trying to achieve, the reason they need the answer. Sharing it helps GitBook give you a better, more relevant answer. A goal is most helpful when it describes the outcome the user wants rather than restating the question. For example, with `ask=how do I create an API token`, a goal like `automate deployments from our CI pipeline` lets GitBook tailor the answer to that use case. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.