The Enterprise version of PDF Converter Professional lets you search and redact specific words or phrases from an open PDF document or multiple PDF documents in a specified folder.
To search and redact text in a PDF document
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Select Document > Redaction > Search and Redact, or click the down arrow next to the 
Mark Redaction button in the Security toolbar and choose Search and Redact in the drop-down menu..
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In the resizable Search dialog box, enter the words or phrases you want to search for in the Search For text field.
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In the Look In field, specify whether to search in the current PDF, multiple PDFs within a package, an entire PDF package, or all PDF files in a specified folder.
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Set the necessary search filters such as Match Case, Match whole word only, etc. and click Search and Redact.
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Check the search result list. To refine your search, click New Search and modify search filters appropriately.
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In the search result list, check all items you want to mark for redaction. If you want to mark all items, click Select All.
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Click Mark Selected Results for Redaction. All checked search results will then be marked for pending redaction.
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To apply redaction, select Document > Redaction > Apply Redaction or click the down arrow next to Mark Redaction tool in the Security toolbar and choose Apply Redaction in the drop-down menu. You can also apply redaction in the document itself by right-clicking each individual redaction mark.
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In the Apply dialog box, check the types of markings that should be removed. If you check the option Remove all occurrences to the marked content, all referred object data will be removed from the PDF. Click Apply to perform redaction.
The topic Redacting Content explains how to redact text and images by selection and also shows the appearance of marked and redacted text.
Note
Redaction cannot be undone once it is applied. To avoid mistakes, we strongly advise you to make a copy of the original PDF files before you perform redaction; or save a redacted PDF as a new file with a different name and/or location.
