Invented by Adobe®, Portable Document Format (PDF) is the published specification used by standards bodies around the world for more secure, reliable electronic document distribution and exchange. Adobe® PDF has been adopted by enterprises, educators, and governments around the world to streamline document exchange, increase productivity, and reduce reliance on paper. It is the standard format for the electronic submission of drug approvals to the U.S. Food and Drug Administration (FDA) and for electronic case filings in U.S. federal courts.
The standard security provided by Arobat® PDF consists of two different methods and two different passwords, "user password" and "owner password". A PDF document may be protected by password to open ('user' password) and the document may also specify 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 (using 'owner' password).
If user password (also known as password to open) is either not set or known, it is possible to remove permission password instantly. Unfortunately, if a user password is unknown, there is no easy way to recover the password to a PDF document. Universal recovery methods, such as Brute Force Attack and Dictionary Attack, must be used. Unfortunately, due to a nature of an encryption method used in PDF files, the password search is very slow. The brute force speed is usually under one thousand passwords per second even on a top-speed modern PC. It means that long password recovery takes too long time.
Password recovery tools
Lost password? There are many tools to find your PDF password back. Most of them can be free download to try before you buy. Some of them list below:
|Name||Remove Owner Pwd.||Find Open Pwd.||Platform||Price||Trial limitations|
|PDF Password Cracker Pro||Windows||$49.95||only decrypt the first half pages of your original PDF file.|
|Advanced PDF Password Recovery Professional||Windows||$99||Unregistered (trial) version can be used during 30 days after installation (although it doesn't expire, actually) and has some limitations.|
|Guaranteed PDF Decrypter||Windows, Linux, Solaris/SunOS||$25-$150||Demo version has some limitations and can correctly decrypt only small files.|
|PDF Password||Windows||$39||Up to 3 characters long password can be search.|
|A-PDF Restrictions Remover||Windows||$9.99||Free 15 days full function trial.|
|PDF Password Remover||Windows||$29.9||1,Popup a message box
2, The trial version is can only process the first half pages from your original PDF file
3, Remove Outlines, Metadata, AcroForm information from some special PDF documents
|Ap PDF Password Recovery||Windows||$27.9|| 1, The trial version only can process the first half of pages in your PDF file.
2, Popup a message box when open the result pdf file.
|Atomic PDF Password Recovery||Windows||$24.85||The trial version only process first 3 pages of your PDF file.|
|PDF Password Recovery||Windows||$19.95||The demo version will add the watermark "Demoversion" to every page of the result file.|
Can remove unknown password instantly.
Cannot remove unknown password. Can search passwords.
Need know password.
Does not support.
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