There are several ways to remove the password for pdf file. In this article, we will consider only one of them - the removal pdf password using a special program, such as Manyprog PDF Password Recovery. This program allows you not only to recover pdf password, and remove protection from pdf file, if the lost username and password password known only to the owner. Generally speaking, open password protected pdf document can be, knowing only one of the passwords, which is very convenient, because the combination of the two passwords are often forgotten.
Let us dwell on the encryption features of pdf files. Passwords are installed on the pdf documents are divided into two categories - user password and owner password. This distinction is due to the peculiarities of this kind of files. Owner password establishes certain restrictions on some manipulation of the document pdf. In contrast, the user's password is intended to protect confidential information and prevent unauthorized access to documents. If the pdf document user password is set, then the file is opened, enter the password. Without the password to open the document and view its contents it will not be possible.
Thus, the user's password prohibits opening pdf documents to persons who do not know the password. If the document is set to further owner password, which restricts certain actions with the document (for example, establishes a ban on the printing of it), the user's password does not remove these restrictions and allows you to open the document only. On this basis, it is not recommended to do the same, these two password protection setting on a pdf file.