In addition to picture data, photos taken with smartphones and modern digital cameras contain metadata, which is additional information about the photo. By default, the photos taken with these cameras can give away sensitive information, and many users are unaware that it’s happening.More people than ever have a camera that’s usually within arm’s reach.To read the XMP tags ofĮmbedded objects, use exiftool -extractEmbedded -all:all $FILE.The mass adoption of smartphones - essentially portable, sensor-rich, location-aware, always-networked computers - has given us two major consequences whose effects on privacy and security aren’t yet fully understood: Embedded objects.Īfter running qpdf, there may be new XMP metadata, as it extracts metadata from any embedded objects. Qpdf can be used to linearize PDF files ( qpdf -linearize $FILE), which optimises them for fast web loading and removes any orphan data. exiftool -all:all=> remove all the tags.Įxiftool -all:all also removes the pointer to the Info Dictionary, but does not completely remove it.exiftool -all:all => read all the tags.exiftoolĮxiftool can be used to read/write XMP metadata from/to PDF files. As noted in the pdftk documentation, though, pdftk does not alter XMP metadata. See pdftk-unset-info-dictionary-values.php below for an example. Pdftk can be used to update the Info Dictionary of a PDF file. To remove previously-deleted data, the PDF file must be rebuilt. When information is removed from a PDF file, the pointer is removed, but the actual data may not be removed. When information is added to a PDF file, it is appended to the end of the file and a pointer is added. XMP packets, which contain RDF statements expressed as XMLĪ PDF file contains a) objects and b) pointers to those objects.
the Info Dictionary, a limited set of key/value pairs.Metadata in PDF files can be stored in at least two places:
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