Redact PDF file using AEM API/SDK

I reasearching Adobe functionlity to redact a PDF document programatically using AEM API (java) and there is little to no documentation on this capability. 

Can anyone speak on this and clarify what are adobe's out of box option with redaction?

There is this reference that hints a possibility:

AEM forms * Redact PDF operation (adobe.com)

AEM forms * Quick Start (SOAP mode): Redacting a PDF document using the Java API (adobe.com)

Thank you