> 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/ios/security.md). # Security - [Securing PDFs with iOS library](https://docs.apryse.com/ios/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. Discover more in our related blog on how t - [Encrypting & securing PDFs on iOS](https://docs.apryse.com/ios/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 iOS](https://docs.apryse.com/ios/security/decrypt.md): Guide to read a PDF document with password protection. - [Apryse Custom Security Handler on iOS](https://docs.apryse.com/ios/security/custom-handler.md): Encrypt and decrypt files securely with the Apryse Custom Security Handler. Ideal for Digital Rights Management (DRM) use cases, this built-in feature simplifies encryption. Learn how to use it effect - [Code samples to secure PDFs via encryption / decryption on iOS](https://docs.apryse.com/ios/security/samples.md): Learn how to Encrypt and Decrypt PDF Files with PDFNet SDK. Explore encryption support, sample code, and UI samples for iOS. Discover the SecurityHandler feature in this showcase demo. The Apryse iOS - [APIs for securing PDFs on iOS](https://docs.apryse.com/ios/security/apis.md): Enhance PDF document security with utility classes for iOS (Objective-C/Swift) using PTSecurityHandler. Find out how to protect your files effectively. The Apryse iOS SDK streamlines secure document p --- # 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/ios/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.