Adobe pdf reader prompts "The validity of the document certificate is unknown. The author cannot be verified"
The blog garden already has a solution to this problem by updating the certificate
See: Solution to the problem of "The validity of the document certificate is unknown. The author cannot be verified" in Adobe Reader - lee2guang - 博客园
https://www.cnblogs.com/lee2guang/p/12965346.html
This article provides another solution to the invalid certificate update or directly ignore the certificate update
Open the Adobe Acrobat Pro file —> [Create] —> [Blank Page]
—> 【Organization page】
—>【Insert from file】
Select blank page, delete, save
Open the newly saved document above again, and there is no "The validity of the document certificate is unknown. The author cannot be verified" prompt
bookmark processing
Select all bookmarks except the first two and push left, delete the first two bookmarks, save
The bookmark is changed from the original folded level to the automatically expanded level, and the index is clear at a glance
occasional problem
The original bookmarks of individual documents have folding levels. After the above operations, the bookmarks are fully unfolded, but the levels are lost, as shown in the figure below
solution
In order to prevent the above occasional problems, do not overwrite the original file when saving the new file.
Use FreePic2Pdf to extract hierarchical bookmarks from the original document, the steps are as follows
Open FreePic2Pdf, —> [Change PDF]
—> [Get bookmark from PDF], directly drag into the original document, —> [Start], the bookmark has been obtained
Change the bookmark folder obtained in the previous step to have the same name as the new document and be in the same directory as the new document, switch to
—> [Put bookmark to PDF], directly drag in a new document, —> [Start]
When opening a new document, bookmarks have been reverted to hierarchical auto-expansion.
Small program in the text
FreePic2Pdf
Link: https://pan.baidu.com/s/1XsOU0wqqZ28F2l7euVQpmA?pwd=viqm
Related extended reading
Comparison of Common Methods of PDF Compression
PDF Sharpness Adjustment ——PDF "Slimming"
There is an error on this page. Acrobat may not display the page correctly. Please contact the creator of the PDF document to correct the errors on this
page
PDF files cannot be printed, converted, merged, or modified, and the message "PDF file is protected" is removed and the password is removed.
How to make PDF bookmarks and convert Word documents to PDF to generate bookmarks and preserve directory hyperlinks
uvz file to pdf pdg to pdf
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