## sign(src_stream, dst_stream, cert_holder, sign_options) {#bytesio_bytesio_certificateholder_signoptions} Signs source document using given [CertificateHolder](../../certificateholder/) and [Sign......FileStream(ARTIFACTS_DIR + 'DigitalSignatureUtil...signed.docx', dst_file_name=ARTIFACTS_DIR + 'DigitalSignatureUtil...