Password

Assigns a password to prevent users from making unauthorized changes.

You should only use passwords that are hard to find by other persons or programs. A password should follow these rules:

Length of eight or more characters.
Contains a mix of lower case and upper case letters, numbers, and special characters.
Cannot be found in any wordbook or encyclopedia.
Has no direct relation to your personal data, e.g., date of birth or car plate.

The open password must be entered to open the file.

The permission password must be entered to edit the document.

Type a password. A password is case sensitive.

Confirm

Re-enter the password.

To remove a password, open the document, then save without password.

Due to the limitations of the PDF file format, PDF passwords used to protect exported PDF files can contain only the following characters: