Cisdem has released PDFPasswordRemover 3 (http://www.cisdem.com/pdf-password-remover-mac.html) for Mac. It’s a PDF unlocking tool to help you recover and remove both user password and owner password.
It supports the ability to “crack” PDFs in any language and any Adobe PDF version (1.0-1.7). PDFPasswordRemover 3 is compatible with Mac OS X 10.7 and higher. It costs $34.99; a “lite” version is available for $19.99. A demo of PDFPasswordRemover 3 is available at at the product website.