ExifTool Forum

ExifTool 10.35 on Windows 10.

Today purely by chance with a Google search I found this page (http://www.exiftool.org/TagNames/PDF.html) in which is mentioned the following very useful info:

QuoteExifTool may be used to write native PDF and XMP metadata to PDF files. It uses an incremental update technique that has the advantages of being both fast and reversible. The original PDF can be easily recovered by deleting the PDF-update pseudo-group (with -PDF-update:all= on the command line).

exiftool --help showed this Note:

Quote3) Changes to PDF files are reversible because the original
information is never actually deleted from the file. So ExifTool
alone may not be used to securely edit metadata in PDF files.

Can you please update it to include the above useful info too, like this?

Quote3) Changes to PDF files are reversible (with "-PDF-update:all=")
because the original information is never actually deleted from
the file. So ExifTool alone may not be used to securely edit
metadata in PDF files.

Thank you!

Thanks for the suggestion.  This will appear in the next release:

            3) Changes to PDF files by ExifTool are reversible (by deleting
            the update with "-PDF-update:all=") because the original
            information is never actually deleted from the file.  So ExifTool
            alone may not be used to securely edit metadata in PDF files.

- Phil

Thank you!