Security and Accessible PDF File
If you are concerned about your accessible PDF files and security, you're in for a real treat! Acrobat 5 has just the feature you're looking for.
Set the Acrobat Standard Security as you normally would, and follow these steps from the Standard Security window:
Select 128-bit RC4 (Acrobat 5) from the Encryption Level pull-down menu in the Permissions pane. The security options change based on the new selection.
Select Enable Content Access for Visually Impaired.
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Deselect Allow Content Copying and Extraction (see Figure 6).
Change other settings in the window as you normally do.
Figure 6 You can disallow content copying and extraction while allowing content access for visually impaired.