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.