Encrypt PDF software is a very flexible and powerful
program, Encrypt PDF software allows you to encrypt
(using standard 40-bit or 128-bit supported by
Acrobat Reader 5.0 and up) existing PDFs, set
permissions, add user and owner password. For example
you can encrypt a PDF without to allow to print it.
The button to print the file will be disabled in
Acrobat Reader application, you also can encrypt a
PDF allowing the user to read it only if he know 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 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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