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

Note, The source PDF must be an unencrypted PDF. Acrobat Reader
will show a key in the bottom status bar if the PDF is encrypted.
There are two passwords you can apply to a PDF. The first is the
owner password, Opening a PDF with this password will allow you
full access to the PDF when a user password has been assigned as
well. This means that even if printing was disabled you will still
be able to print the PDF when using this password. No password will
be prompted for when opening the PDF if you secure it with only an
owner password. The second is the user password, Opening a PDF with
this password will restrict you based on how the PDF was password
protected (printing may be disabled, for instance).

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