docs: def load(self, record_key, secret_key=''):
          
          '''
              a method to retrieve byte data of an S3 record
  
          :param record_key: string with name of record
          :param secret_key: [optional] string used to decrypt data
          :return: byte data for record body
          '''
          
          title = '%s.load' % self.__class__.__name__
      
      # validate inputs
          input_fields = {
              'record_key': record_key,
              'secret_key': secret_key
          }
          for key, value in input_fields.items():
              if value:
                  object_title = '%s(%s=%s)' % (title, key, str(value))
                  self.fields.validate(value, '.%s' % key, object_title)
      
      # retrieve record data from s3
          record_data, record_metadata = self.s3.read_record(self.bucket_name, record_key)
      
      # validate secret key
          error_msg = '%s(secret_key="...") required to decrypt record "%s"' % (title, record_key)
          if 'encryption' in record_metadata['metadata'].keys():
              if record_metadata['metadata']['encryption'] == 'lab512':
                  if not secret_key:
                      raise Exception(error_msg)
              else:
                  self.s3.iam.printer('[WARNING]: %s uses unrecognized encryption method. Decryption skipped.' % record_key)
                  secret_key = ''
                  
      # decrypt (if necessary)
          if secret_key:
              from labpack.encryption import cryptolab
              record_data = cryptolab.decrypt(record_data, secret_key)
      
          return record_data