[{'role': 'user', 'content': "Analyze the following clause from a privacy policy and determine if it's fair or unfair. Also identify any privacy practices mentioned: In addition, certain BlackBerry systems and processes are externally certified on a regular basis (e.g. certification to ISO/IEC 27001:2005 Information Security Management System standard)."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]