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Why does the keyword metadata not display in Acrobat Reader, but does in other readers?

New Here ,
Apr 19, 2023 Apr 19, 2023

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A PDF generated by Microsoft PowerPoint 2019 has a keywords metadata:

 

/Keywords(<semicolon-separated_keywords>)

 

Google Chrome and FireFox PDF.js readers will display the keywords in the document properties, but not Acrobat Reader, why?

 

The PDF Reference, version 1.7 (version of this PDF file) includes this metadata among others, although it is not specified whether or not the list should be separated by semicolons. Also, using only one keyword to isolate the problem does not change anything.

 

(Original question.)

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New Here ,
Apr 20, 2023 Apr 20, 2023

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(Source: answer to the original question).

 

In this PDF file, metadata are stored both in old and XMP format.

 

Using cpdf command as shown below:

cpdf synthèse_etude_canaux_communication.pdf -info

 

... Would show the metadatas stored in these formats:

  • Title: <title>
  • Author: <author>
  • Keywords: <keywords>
  • Creator: Microsoft PowerPoint 2019
  • Producer: Microsoft PowerPoint 2019
  • ...
  • Created: D:20210713102823+02'00'
  • Modified: D:20210921101251+02'00'
  • XMP pdf:Producer: Microsoft® PowerPoint® 2019
  • XMP xmp:CreateDate: 2021-07-13T10:28:23+02:00
  • XMP xmp:CreatorTool: Microsoft® PowerPoint® 2019
  • XMP xmp:MetadataDate: 2021-09-21T10:12:51+02:00
  • XMP xmp:ModifyDate: 2021-09-21T10:12:51+02:00
  • XMP dc:title: <title>
  • XMP dc:creator: <author>

 

Not yet confirmed by a source, but it seems that Adobe Acrobat prefer XMP over old-style metadata, not mixing them, and that's why the keywords aren't displayed in the document properties.

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LEGEND ,
Apr 20, 2023 Apr 20, 2023

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Worth noting that the Info dictionary, and hence /Keywords, is obsolete in PDF 2.0. Conforming PDF 2.0 readers ignore it, I think. For many years Acrobat has set both Info and XMP metadata. 

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