Interface > Working with Data Exchange Formats > PDF > To Disable Text Access for the Visually Impaired
  
To Disable Text Access for the Visually Impaired
1. In the PDF Export Settings dialog box, click Security > Restrict Viewer Operations.
2. Clear the Enable copying of text, images, and other content box.
3. Clear the Enable text access for screen reader devices for the visually impaired box. Screen reader access is disabled.