How to add 'restriction password' to PDF files?

Want to add "restriction password" protection to PDF files? You may wish to follow the guidance of PHP editor Baicao to easily achieve file protection! Today, when network information security is becoming increasingly important, adding password protection to PDF files is a very necessary step. By setting a "restriction password", you can effectively prevent unauthorized users from modifying or viewing the file content. Next, we will introduce how to add "restriction password" to PDF files by using Adobe Acrobat software to better protect your files.

PDF files can be prevented from being modified at will by adding a "restriction password". Even when using an editor, a password is required to edit and modify, ensuring the security of the file content.

In order to set up password protection, you need to use a PDF editor that supports password functionality. For example, in the editor I use, you can click [Protect] in the menu tab, and then select [Restrict Editing] to set it.

After clicking [Restrict Editing], enter the password you want to set twice in the password field. In [Document Permissions], you can choose whether to restrict "Print Permissions", "Content Copying" and "Change Documents" as needed.

In the "Change Document" column, you can further select restricted content.

After completing the selection, click [OK] and save the file. The "restriction password" of the PDF will be added. It can be seen that after the file is restricted, most menu tabs are gray and cannot be clicked.

If subsequent PDF files do not require restriction protection, or if you want to edit the file, you must delete the "restriction password".

Similarly, after opening the PDF file through the PDF editor, click [Delete Security Settings] in the menu tab [Protection] list to delete it.

After clicking, a password dialog box will pop up. Enter the originally set password in the password field, click [OK] and save the file. The "restricted password" of the PDF will be deleted.

As can be seen from the above operations, using the PDF editor to delete the "restriction password" requires entering the originally set password, so remember to remember or save the password when setting the password, otherwise you will not be able to edit and modify the file later. .

What should I do if I really forget my password? In this case we need tools to solve the problem.

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