Nuance pdf create! 3-help Manuale Utente

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Before setting permissions you must supply and confirm a permissions password 
and specify the encryption strength: 40-bit or 128-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.
Note: 
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.
Note:
Older PDF viewers may not support above 40-bit encryption.
Note:
ScanSoft PDF Create! 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.
Watermarks
ScanSoft PDF Create! lets you add watermarks to the first page or all pages of 
your PDF files. A watermark is like a stamp: it can come from text (such as 
‘Confidential’, ‘Draft’ or ‘Sample’) from an image (such as a company logo) or 
from a composite, which is a combination of existing watermarks. A page from an 
existing PDF can also be used as a watermark in a new PDF.
 Watermark Name
Choose from standard watermark controls:
Company logo (import your company logo from an image or PDF file)
Do Not Copy (gray vertical text, top left)
Draft only (gray, angled text, centered)
Sample Only (red, angled text, bottom left)
Crosspage Watermark (import image from an image or PDF file)
Composite Watermark (mixture of text and image watermarks)
Confidential (5 choices: gray text in different locations)
 Opacity
Defines how transparent the watermark should be. Use the slider or edit box to 
define a value between 0 (fully transparent) and 100 (fully opaque). PDF files in 
version 1.3 cannot interpret this setting, watermarks appear at full strength (100).