However, you can only do this by opening it and printing it to a new PDF. Unfortunately and honestly, there is no easy way to remove a password if you don’t know it. If you don't know the file opening password, you cannot remove the file security unless using an illegal password remover. However, it is only possible when you've already known the password.
That might seem like a hectic way to get around? But don't worry, you can remove the password with a PDF editor like WPS PDF to save yourself some inconvenience. Moreover, encrypted PDFs need the password to enter each time if you want to view the document. Concerning information security, it is common for PDF files to be password-encrypted, which prevents them from being opened, edited, and printed without a proper authorization.