From iPubsoft Studio:
Owner Password is always used to protect PDF from editing, printing, copying, modifying, changing, form filling, signing, commenting, etc. The PDF Password Cracker can unlock the PDF automatically and create unlocked PDF copy without entering the password. User Password, also known as open password, is used to protect files from opening and viewing. The program can easily remove the user password to unlock PDF when you correctly type the password manually. Reuse PDF after Decryption. View PDF files freely, as well as copy content, print PDF as you like. Decrypt Multiple PDF files in a Batch. Batch decryption means you can remove restrictions or password from a batch of encrypted PDFs at one time. This high working efficiency saves your valuable time if you have a large number of PDFs to be dealt with.