In case you wonder: the term preflight was derived from the long list of checks that pilots have to complete before taking off with an airplane.
who should do the check and when it should be done. 
the tools that are available to check page content. To make sure that a file matches the requirements to reproduce its correctly, it needs to be checked or ‘preflighted’. Using PDF is, however, no guarantee that the receiver of a file can actually output it as intended. The PDF file format is a solid standard to exchange pages, ranging from single ads to complete publications. Nowadays PDF files are sent to printing companies. You can set permissions when you first save or export a PDF, or later by choosing File > Edit Permissions if you possess the owner password.Preflighting is the process of checking if the digital data required to print a job are all present and valid. macOS Monterey, however, added permissions to Preview’s feature set that lets the PDF’s “owner” control who can print the PDF copy images or text insert, rotate, or delete pages add annotations or signatures or fill in form fields. In older macOS versions, passwords could only control whether someone in possession of the file could open it. 
When handling sensitive documents, you can password protect and encrypt PDFs in Preview. When you sign on the phone it’s simultaneously displayed in Preview for you to review and save. To use your iPhone, you select this option from Preview’s signature tool, and a signature page displays on the iPhone paired with your Mac.
You can create a signature by signing your name on your Mac’s trackpad or by holding your written signature on white paper in front of your Mac’s camera. Preview also supports form filling and signatures.
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