Cisdem has updated PDFPasswordRemover (https://www.cisdem.com/pdf-password-remover-mac.html), its PDF password remover for decrypting both owner password and open passwords on a Mac.
Version 3.5.0 can not only be used to remove a PDF owner password (used to limit printing, copying and editing PDF files), but also recover PDF user password (used to limit opening PDF files) using brute force decryption. The software allows you to remove limitations of PDF files that are protected by owner password in batch.
PDFPassworld Remover 3.5.0 costs $34.99. Discounts are offered for qualified students and educators of qualifying educational institutions. A demo is available for download.