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.
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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