> 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/core/security.md). # Security - [Securing PDFs with Server/Desktop library](https://docs.apryse.com/core/security/security.md): Learn how to secure and read documents with encryption using PDFSecure, a powerful command-line tool. Protect your PDFs with password and adjust permissions effortlessly. The Apryse Server SDK streaml - [Encrypting & securing PDFs on Server/Desktop](https://docs.apryse.com/core/security/encrypt.md): Secure PDF documents with password protection and adjust permissions using Apryse SDK. Learn about encryption support, standard security handler, user and owner passwords, and custom security handlers - [Decrypt & read a PDF document on Server/Desktop](https://docs.apryse.com/core/security/decrypt.md): Guide to read and decrypt a PDF document with password protection. Discover how to integrate Apryse SDK into .NET Framework applications on Windows. Get a free trial with unlimited usage and support. - [Apryse Custom Security Handler on Server/Desktop](https://docs.apryse.com/core/security/custom-handler.md): Discover how the Apryse Custom Security Handler encrypts files for Digital Rights Management (DRM) with built-in simplicity. Learn about encryption methods and unique application custom ids for enhanc - [Code samples to secure PDFs via encryption / decryption on Server/Desktop](https://docs.apryse.com/core/security/samples.md): Learn how to encrypt and decrypt PDF files with PDFNet. This sample code demonstrates encryption support, allowing you to secure your documents effectively. The Apryse Server SDK streamlines secure do - [APIs for securing PDFs on Server/Desktop](https://docs.apryse.com/core/security/apis.md): Discover utility classes for securing PDF documents in various programming languages such as C++, Java, Android, Web (Javascript), Node.js, .NET, .NET Core, iOS, Xamarin.Android, and Xamarin.iOS with --- # 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/core/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.