> 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/xamarin/security.md). # Security - [Securing PDFs with Xamarin library](https://docs.apryse.com/xamarin/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 about password protecting PD - [Encrypting & securing PDFs in Xamarin](https://docs.apryse.com/xamarin/security/encrypt.md): Secure PDF documents with password protection and permissions using Apryse SDK. Learn about encryption support, standard security handlers, and custom implementations for enhanced document security. T - [Decrypt & read a PDF document in Xamarin](https://docs.apryse.com/xamarin/security/decrypt.md): Guide to read a PDF document with password protection. - [Apryse Custom Security Handler in Xamarin](https://docs.apryse.com/xamarin/security/custom-handler.md): Encrypt and decrypt files securely with Apryse Custom Security Handler. Learn how to protect your documents with DRM encryption using this built-in SDK feature. Find out more here! The Apryse Xamarin - [Code samples to secure PDFs via encryption / decryption in Xamarin](https://docs.apryse.com/xamarin/security/samples.md): Learn how to Encrypt and Decrypt PDF Files with PDFNet SDK. Explore encryption support and security features in Xamarin.Android and Xamarin.iOS showcase sample apps. Unlock the power of secure documen - [APIs for securing PDFs in Xamarin](https://docs.apryse.com/xamarin/security/apis.md): Secure your PDF documents with utility classes for Xamarin.Android and Xamarin.iOS using pdftron.SDF.SecurityHandler in C#. Learn how to enhance document security now! The Apryse Xamarin SDK streamlin --- # 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/xamarin/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.