> 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/cli/pdfsecure.md). # PDFSecure - [PDFSecure: Command-line PDF Security & Encryption](https://docs.apryse.com/cli/pdfsecure/pdf-secure.md): Secure your PDF documents efficiently with Apryse's PDFSecure. Add, remove, or change security settings with ease. Encrypt with industry-standard security and optimize for web. Learn more at apryse.co - [Installation & Setup for PDFSecure](https://docs.apryse.com/cli/pdfsecure/installation.md): Download PDFSecure Command-line Application from www.apryse.com. Unzip the file, copy the license for registration. Get the demo version for evaluation. Easily uninstall by deleting the folder. The Ap - [Examples of securing PDFs from command-line](https://docs.apryse.com/cli/pdfsecure/usage.md): Secure your PDF documents with Apryse's PDFSecure command-line application. Add, remove, or change security settings easily. Learn how to use PDFSecure with various examples and options. The Apryse CL - [Options](https://docs.apryse.com/cli/pdfsecure/options.md) - [Command-Line Summary for PDFSecure](https://docs.apryse.com/cli/pdfsecure/options/command-line.md): Discover the best tips for creating an effective SEO meta description. Learn how to craft compelling descriptions that drive clicks and improve your website's visibility. The Apryse CLI streamlines se - [Setting PDF Permissions from Command-line](https://docs.apryse.com/cli/pdfsecure/options/permission.md): Learn how to adjust PDF permissions with owner passwords, set user and owner passwords for different access levels, and secure your documents effectively. The Apryse CLI streamlines secure document pr - [Editing PDF Metadata with Command-line](https://docs.apryse.com/cli/pdfsecure/options/information.md): Securely modify document information metadata with PDFSecure. Automatically update details across all generated documents. Learn more about the options available. The Apryse CLI streamlines secure doc - [Frequently Asked Questions](https://docs.apryse.com/cli/pdfsecure/faq.md): Discover the differences between PDFSecure and PDF SDK. Learn how PDFSecure stands out as a specialized tool for security settings, while PDF SDK offers a comprehensive toolkit for PDF manipulation. I --- # 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/cli/pdfsecure.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.