Adobe Acrobat uses different algorithms to apply PDF security with 40, 128 and 256 bit keys. PDF restrictions are insecure and permissions pdf password remover mac could be removed instantly. PDF restrictions removal is an instant process. This process takes 1-2 days on one modern desktop computer and could be accelerated on GPU.
GuaPDF is the first PDF password remover software ever! GuaPDF has special support of PDF forms. It demonstrates processing of both security methods but has some limitations and can correctly decrypt only small files. It also doesn’t contain distributed computing mechanism. All these version are licensed for non-commercial purposes only. You need GPU version only if you have modern GPU card and searching for open password!