It is possible to remove confidential information from recognized text with FineReader PDF in the following way:

1. Open the PDF file in PDF Editor.
2. In FineReader PDF 16: Go to the Security tab and click the button. 
   In FineReader PDF 15: Go to Tools > Redaction Mode or click the  button on the main toolbar at the top of the Text pane.
3. In the Text pane, use the marker to obliterate the required text.
   

   Note: In case of mistakenly redacting some characters, it is possible to undo the last redaction by pressing Ctrl+Z on the keyboard or by clicking the Undo button on the main toolbar.

4. Save the document.

The redacted text will appear as dots in the output document. If the saved format supports text and background colors, the redacted text fragments will appear as black rectangles.

To switch off the redaction mode, please: 

In FineReader PDF 16: Click the Redact button once again, or switch to the Document tab.

In FineReader PDF 15: Click the Tools > Redaction Mode, or click the Redact button on the main toolbar.

Additional information

Video: How to protect and redact in PDF file.