PDF Password Security

Protect or unprotect PDF files with Password security using our products.

	A-PDF Restrictions Remover	A-PDF Password Security
Decrypt PDF files *
Encrypt PDF files **
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* Support 40-bit and 128 bit RC4 encryption
** Support128 bit RC4 encryption

About PDF Standard Password Security

The built-in encryption method provided by PDF allows for the following functionality. A document has two passwords: an owner password and a user password. The document also specifies operations that should be restricted even when the document is decrypted: printing; copying text and graphics out of the document; modifying the document; and adding or modifying text notes and AcroForm fields. When the correct user password is supplied, the document is opened and decrypted but these operations are restricted; when the owner password is supplied, all operations are allowed. The owner password is required to change these passwords and restrictions.

A document is encrypted whenever a user or owner password or restrictions are supplied for the document. However, a user is prompted for a password on opening a document only if the document has a user password.

How Can I Know If a PDF File Has Password Security?

screenshot of security in Adobe Acrobat Reader

screenshot of restrictions summary in Adobe Acrobat Reader

When you see the icon at the bottom left of the Acrobat/Acrobat Reader program window, it indicates that the PDF file is secured. Place your mouse cursor over that 'locked' icon, and you will see a listing of the security options that were applied to the file.

For more information about a file's security settings, you can click 'File|Document Properties' in the Acrobat/Acrobat Reader menu bar. Then selecting the Security tab will show more detail about the file restrictions.

Notes: if you are using Acrobat Reader, some restrictions will be Not Allowed always, even the file has not be encrypted. Because Acrobat Reader can not do that simply. The restrictions may include: Document Assembly, Commenting, Signing etc.

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