PDFs that cannot copy selections can be copied by using Chrome’s print function “Save to PDF”.
Is that possible? I tried it and it was true.
This page is auto-translated from /nishio/コピーできないPDF using DeepL. If you looks something interesting but the auto-translated English is not good enough to understand it, feel free to let me know at @nishio_en. I’m very happy to spread my thought to non-Japanese readers.