[{'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: This is built and signed by us, and Google Play uses these signatures to verify that the copy you get is from us. Other app stores, including Amazon, may have a copy of the Barcode Scanner app, but these are not built or maintained by us."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]