They are so horrible that you still need to have some quirks in your reader, because some important tool still generates it incorrectly , but it is still correc

They are so horrible that you still need to have some quirks in your reader, because some important tool still generates it incorrectly , but it is still correct. Then there are loops and some software Try to parse them. The encryption types, the security, which is bonkers… why should it be possible to disallow printing or analyzing it with another software, there are attachments, forms, JavaScript… And then there is xfa (Especially the dynamic one), a format in a format which basically totally different than a pdf. But it is inside the pdf container and people expect that you understand it. Thank god that pdf 2.0 probably kills it.