def get_remembered_encrypted_identity(self, subject_context):
if (self.is_identity_removed(subject_context)):<EOL><INDENT>if not isinstance(subject_context, web_subject_abcs.WebSubjectContext):<EOL><INDENT>msg = ("<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>"<EOL>"<STR_LIT>")<EOL>logger.debug(msg)<EOL><DEDENT>return None<EOL><DEDENT>remember_me = subject_context.web_registry.remember_me<EOL>if remember_me:<EOL><INDENT>logger.debug("<STR_LIT>" + str(remember_me) + "<STR_LIT:]>")<EOL>encrypted = base64.b64decode(remember_me)<EOL>return encrypted<EOL><DEDENT>else:<EOL><INDENT>return None<EOL><DEDENT>
Returns a previously serialized identity byte array or None if the byte
array could not be acquired.

This implementation retrieves an HTTP cookie, Base64-decodes the cookie
value, and returns the resulting byte array.

The ``subject_context`` instance is expected to be a ``WebSubjectContext``
instance with a web_registry so that an HTTP cookie may be
retrieved from an incoming request.  If it is not a ``WebSubjectContext``
or is one yet does not have a web_registry, this implementation returns
None.

:param subject_context: the contextual data used to construct a ``Subject`` instance

:returns: an encrypted, serialized identifier collection