## sign(src_stream, dst_stream, cert_holder, sign_options) {#bytesio_bytesio_certificateholder_signoptions} Signs source document using given [CertificateHolder](../../certificateholder/) and [Sign......sign(self, src_stream: io.BytesIO, dst_stream: io.BytesIO, cert_holder:...| --- | --- | | src_stream | io.BytesIO | The stream which contains...