Watermarking pdf: copy TOC/outline from source to destination

[philipaxer]

Explanation

The documentation gives an example how to watermark a pdf. While this works, the outlines of the original PDF is lost. Usually technical documenation is watermarked and the outlines are quite helpful to navigate the document. How can i carry over the outline from the source PDF to the destination?

[pubpub-zz]

you should be able to first load (using clone_from= within the PdfWriter constructor) your pdf file or using .append().
Within the PdfWriter you should be able to loop through the page and use https://pypdf.readthedocs.io/en/stable/modules/PageObject.html#pypdf._page.PageObject.merge_page to apply the watermark.
Can you test this approach?

[philipaxer]

Hi, thanks for the suggestion. That has worked nicely, all meta data is carried over.

[pubpub-zz]

Would you be ok to propose a PR to update the documentation to present the solution?

[pubpub-zz]

#1952 has updated the documentation. we can close this issue