How to set an owner password for a pdf file using command line?

A pdf owner password is the password used to set document restrictions in pdf files. In Adobe Acrobat, the pdf owner password is called the change permissions password. As of the latest PDF version, document restrictions can include printing, changing the document, document assembly, content copying, content copying for accessibility, page extraction, commenting, filling of form fields, signing, and creation of template pages. Therefore, setting an owner password allows you to protect your copyrights. The follow part will show you how to set an owner password for a pdf file using Advanced PDF Tools Command Line.

First step—Downloading

Follow this link you will obtain Advanced PDF Tools

http://www.verypdf.com/pdfinfoeditor/advanced_pdf_tools_cmd.zip

The whole package is just of 3.04 MB, making the download swiftly, do remember to extract it, for it is a zipped package.

Second step—Launching

You are bound to launch MS-DOS command prompt window. Because the command line is bound to be operated under the MS-DOS environment. The procedure is easy, and the following pictures will guide you.

1) click “start” and then go to “Run”

click start

choose run

2) input cmd into the following

run dialog

3) press “ok”, you will find MS-DOS command prompt window popping up

command prompt

Third step—Inputting

input command line to set an owner password for a pdf file

it goes below

pdftools.exe -i C:\*.pdf -o D:\*.pdf  -S ownerpwd=123  -S keylen=2

where

  •  -i is to specify a pdf filename or a directory for input,
  •  -o is to specify the pdf file name for output,
  • -S ownerpwd=123 to set owner password as 123,
  • -S keylen=2 refers to 128 bit AES encryption (Acrobat 7 or higher)

when the input is done, press “enter” key, you will see

detailed operation

Fourth step—Checking

Snap154

you will find there is a security setting appeared. If you click “Permission Details”, a window will popup  showing the document restrictions. and you click “Change Setting”, an owner password is needed, see below,

psssword inputing

and then typing owner password 123, you are allowed to see,

setting

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