A simple program PDF Password Remover Free will help you reset user password from a PDF file. This fast utility will be especially useful to those users who do not have any tools for working with PDF documents. To remove a password just follows these steps.
Run the program and specify the path to the encrypted PDF file.
Enter the owner password of the PDF file.
Click the button "Unprotect..." and specify the name of the decrypted copy of the file and the place where it should be saved.
This video will help you with this simple and fast program.