I don't think there are any PDF 2.0 files "out in the wild" yet. In any case the article is about a 40 bit RC4 key. PDF has supported much much stronger encry

I don't think there are any PDF 2.0 files "out in the wild" yet. In any case the article is about a 40 bit RC4 key. PDF has supported much much stronger encryption schemes for a very very long time. https://www.pdflib.com/knowledge-base/pdf-password-security/encryption/ https://www.pdflib.com/knowledge-base/pdf-password-security/...