## Sign(*Stream, Stream, [CertificateHolder](../../certificateholder/), [SignOptions](../../signoptions/)*) {#sign_1} Signs source document using given [`CertificateHolder`](../../certificateholder......formats are: Doc, Dot, Docx, Dotx, Docm, Dotm, Odt, Ott. **Output...formats are: Doc, Dot, Docx, Dotx, Docm, Dotm, Odt, Ott. ```csharp...