You can add passwords to PDF files you create and prohibit or allow
actions, such as printing, extracting content and editing. Choose a standard
control and click Advanced to
specify passwords and permissions.
You can specify two passwords:
Open Password
Anyone providing this password can view the PDF it protects. This is
sometimes called a user password. Further use of such a PDF depends on
which permissions are set.
Permissions Password
Anyone providing this password can view the PDF and use it freely, regardless
of permissions settings. They can also modify, remove or add permissions
settings. This is sometimes called a master or owner password.
Before setting permissions you must supply and confirm a permissions
password and specify the encryption strength:
40-bit, 128-bit or 256-bit. This determines which permissions are available.
Make your settings and click OK.
Use New to name a new standard
security control, make the desired settings and click OK. Use Delete
to remove a security control. Use Default
to return supplied controls to default values and remove user-defined
controls.
Notes
Be sure to note the passwords you assign; without them
you will not be able to re-open the PDF files you created. Successful
PDF protection depends on good password distribution management.
Older PDF viewers may not support above 40-bit encryption.
PDF Professional usually creates “Normal” PDF files. That
means they can be viewed, printed, searched and modified in a PDF editor.
But if some actions are prohibited and a user cannot supply the correct
permissions password, the PDF may appear as image-only.
