Feb. 24, 2011, 2:35 a.m.
posted by r11
Selecting the Require a Password to Open the Document check box in the Password Security - Settings dialog box limits access to the PDF file to only those who know the password. The only practical way to open password- protected files is by entering the password, which is a good incentive to use passwords that you can easily remember but are difficult for others to guess.
To apply password security to a file so that users must enter a password to open the file, follow these steps:
Have a PDF file open and then open the Password Security - Settings dialog box.
Do so by clicking and holding down on the Secure button on the Security taskbar and choosing Restrict Opening and Editing.
Select the Require a Password to Open the Document check box.
Enter a logical password that will be required to open the file in the Document Open Password text field.
You can also add additional security settings, which we outline in the next section. Or you can use this as the only security to be applied to the document.
If this is the only security measure you apply to the document, authorized users are able to access the document by entering a password and are also able to edit or print the document.
Click the OK button.
Close and reopen the PDF file.
A password dialog box appears asking for the proper password to be entered for access to this file. Now, every time a user accesses the file, this dialog box appears.