If you want to encrypt a PDF file, you can use the encryption method that comes with the PDF file to encrypt, or you can use Windows encryption or encryption software to encrypt. Today we will talk about how to use the encryption method that comes with PDF files to encrypt and decrypt PDF files.
PDF file encryption is divided into open password and restricted editing. If you want to set a PDF open password, open the PDF file that needs to be encrypted in the PDF editor, click File – Properties – Security – Password Protection – check the open password and enter the PDF you want to set Just save the password.
If you want to set a restricted editing password, we can in the same place, uncheck the open password, only check the permission password and set the password to save it.
To decrypt the open password of the PDF file, we need to enter the password to open the PDF file first, enter the PDF file, click File – Properties – Security – Password Protection – delete the open password to save the settings.
If you want to cancel the restricted editing of the PDF file, we open the PDF file and click File – Properties – Security – Password Protection – Enter the PDF restricted editing password – delete the restricted password to save the settings.
Need to remind everyone, no matter what kind of password is set, you must remember the password. If you forget the password, you will not be able to open the PDF file or edit the PDF file. However, if you really forget the password, you can use tools to decrypt it, such as Okayfeng PDF Decryption master, four methods to help us retrieve the password to open, one-click decryption of restricted editing of PDF files
