Acrobat Standard Security enables you to set two passwords on a PDF: the user password and the owner password. In Acrobat 6, these are also called the Open password and the Permissions password, respectively.
The user password, if set, is necessary for viewing the document pages. The PDF encryption key is derived from the user password, so it really is required. When a PDF viewer tries to open a PDF that was secured with a user password, it will prompt the reader to supply the correct password.
The owner password, if set, is necessary for changing the document security settings. A PDF with both its user and owner passwords set can be opened with either password, so you should choose both with equal care.
An owner password by itself does not provide any real PDF security. The content is encrypted, but the key, which is derived from the (empty) user password, is known. By itself, an owner password is a polite but firm request to respect the author's wishes. A rogue program could strip this security in a second.
2 comments:
Hi,
Now by using software, you can convert password-protected pdf files to word .doc format too but for this, user must know the password of the pdf file. Kernel for pdf to word tool is devised to meet the routine needs of converting pdf to word for requisite modification of data. Thanks a lot.
I was not aware of PDF password. Thank you for posting on it. Its looking very useful feature of PDF files. I will surely check it.
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