[{'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: By using the Com2uS Service, or by accessing any materials posted on the Com2uS Service by Com2uS, or derivative works thereof, you acknowledge that you do not acquire any ownership rights."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]