.You can redact sections or entire pages of a file and thus make them invisible to the user. In contrast to the colored annotation that you place above a text area, the redacted text passages cannot be made visible again by PDF viewers via copy and paste.
In the menu above the file, click the “Redactions” tab and open the associated menu.
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Fig.: “Redactions” menu
Click the color icon 
in the menu.
Use drag and drop to highlight the part of the page that should be redacted.
A context menu appears:
Fig.: Context menu “Edit redaction”
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Color and border color |
Select the background color and border color via the first two icons. |
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Level order |
Specify the order of the levels if multiple annotations or redactions were added above each other. |
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Comment function |
Just as in every annotation, you can also add a comment via the comment icon. |
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Delete redaction |
Use the recycling bin icon to delete the redaction. |
First click the icon “Redact text”
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Now drag the mouse over the text that should be redacted.
Click the icon “Redact entire page” 
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Fig.: Dialog “Redact entire page”
Now you can redact the current page, individual pages or all pages.