[{'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: (2) Avast FileRep: Avast FileRep is a database of executable files sourced from users who agree to participate in the service. The files (or their hashes - i.e., deidentified versions of the files) are stored and evaluated for the purpose of determining which are infectious and updating virus databases. Participation in Avast FileRep is voluntary, and data is not stored in a way that permits it to be associated with particular users. No user is required to agree to participate in the Avast FileRep service."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]