## sign(src_stream, dst_stream, cert_holder, sign_options) {#bytesio_bytesio_certificateholder_signoptions} Signs source document using given [CertificateHolder](../../certificateholder/) and [Sign......DOT](../../..aspose.words/loadformat/#DOT), [LoadFormat...[LoadFormat.DOT](../../..aspose.words/loadformat/#DOT), [LoadFormat...