This made me think of something I came across recently that’s almost the opposite problem of requiring PDFs to be searchable. A local government would publish PDFs where the text is clearly readable on screen, but the selectable text layer is intentionally scrambled, so copy/paste or search returns garbage. It's a very hostile thing to do, especially with public data!

I have encountered PDFs that would exhibit this behavior in one browser but not in another.

One fun thing I encountered from local government is releasing files with potato quality resolution and not considering the page size.

I had a FOI request that returned mainly Arch D sized drawings but they were in a 94 DPI PDF rendered as letter sized. It was a fun conversation trying to explain to an annoyed city employee that putting those large drawings in a 94 DPI letter size page effectively made it 30-ish DPI.

Hostile indeed, and also happens in user-facing documents like product manuals!

run some ocr on them after to recreate the text layer?

With the aggressive push of LLMs and Generative AI ..i am expecting a lot of OCR features to become "smarter" by default, namely go beyond mechanical OCR and start inserting hallucinations and sematically/contextually "more correct" information in OCR output

It's not hard to imagine some powerful LLMs being able to undo some light redactions that are deducible based on context

Or worse, making up names or information instead of writing the reaction.