We can use Encrypt PDF v2.3 software to realize the encryption function. Encrypt PDF software is a very flexible and powerful program. It allows you to encrypt existing PDFs by using standard 40-bit or 128-bit supported by Acrobat Reader 7.0 and up, set permissions, add user and owner password. For example you can encrypt a PDF without to allow to print it. The button to print the file will be disabled in Acrobat Reader application, you also can encrypt a PDF allowing the user to read it only if he know the correct password.

Double click the Encrypt PDF icon on your desktop or click start-> program-> Encrypt PDF v2.3 to open the software. Then you can see a file list with several control icons below on the software panel.





File list

The file list records every PDF file's state, including encrypting result, events associated with the result, source document and target document.

* Result: There are two results can be shown, SUCCEED and ERROR.
* Event: If the encryption action is successful, the event can be shown "File Encrypted", otherwise, if the file has been encrypted, so the word shows "This file has been encrypted before".
* Source document: records the source file name and its path.
* Target document: records the target file name and path.

Encrypting PDF documents

To encrypt a PDF document, you can set the encryption option first by click Setting icon, with the options dialog shows like below:





* Specify Password
To set the user password and master password according your need. With user password, you can only open the document, and master password ( also called owner password) to change permission and passwords.

* Encryption Level
Choose 40-bit or 128-bit according to the version of Acrobat software. 40 and 128 are the length of the encryption key in bits.

* Permission
To set the usage restriction to those who have user password.
* No Printing: You can read the document but not allowed to print it.
* No Changing the Document: You can read the file without permission to edit it.
* No Content Copying or Extraction: Not allowed to select a block of the file to copy to the clipboard.
* No Adding or Changing Form fields: Not allowed to modify forms in the file.

Note: You can set these options before you open more than one PDF documents, letting all the documents be opened with the same password. Or you can set different options to each document before you open every one of them. There is a key shape icon shown on the left bottom of the status bar when the encrypted file is opened, even if you don't choose any option and just open and save as a target file, the icon can still be seen.

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Encrypt PDF

Encrypt PDF software is a very flexible and powerful program, Encrypt PDF software allows you to encrypt (using standard 40-bit or 128-bit supported by Acrobat Reader 7.0 and up) existing PDFs, set permissions, add user and owner password. For example you can encrypt a PDF without to allow to print it. The button to print the file will be disabled in Acrobat Reader application, you also can encrypt a PDF allowing the user to read it only if he know the correct password. Free to try it.