The post discusses techniques for safely converting untrusted PDFs into trusted versions through the use of a concept called Qubes. A related tool, Dangerzone, allows users to do this safely on non-Qubes systems by using sandboxes and optimizing file outputs. Discussions in the comments elaborate on the need for security with file handling, and technical alternatives for safe document processing are proposed. Commenters note that while the security architecture is robust, the file sizes of outputs can be overwhelming and present a challenge for practical use. Moreover, there are suggestions for improving efficiency and exploring alternative formats such as ePub.