This GroupDocs.Redaction .NET SDK provides API access to this service. It is a document redaction API for PDF, raster images and Microsoft Office file formats. It allows you to hide or remove confidential information from password protected files using text, metadata and annotation redaction types. It provides a way to save documents in the original format and then create a PDF file with raster images of the document pages. GroupDocs provides document manipulation APIs that allows you to view, convert, annotate, compare, sign, assemble and search documents in your applications.