GroupDocs.Redaction for .NET is an API library that helps you erase sensitive and classified data from ‎various file formats, such as, Microsoft Word, Excel, PowerPoint and PDF. The Redaction API’s format-independent interface supports redaction of various types, e.g., text redaction, metadata ‎redaction, annotation redaction, and tabular document redaction. It ‎also allows you to redact password protected files. You are allowed to save the document in its original ‎format as well as create a sanitized PDF document with raster images of original pages.‎‎