public static void UnprotectDocument() { //Load the protected word file WordFile wordFile = new WordFile(); WordDocument document = wordFile.Import(File.ReadAllBytes("Protected.docx")); WordDocumentBuilder builder = new WordDocumentBuilder(document); //If you have own the password, you can unprotect the document with password //builder.Unprotect("password"); //If you don't own the password, you can unprotect the document without password builder.Unprotect(); File.WriteAllBytes("Unprotected.docx", wordFile.Export(document)); }