[{'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: Starting with Viber 6.0, all of Viber's core features are secured with end-to-end encryption: Viber calls, one-on-one messages, group messages, media sharing and secondary devices. This means that the encryption keys are stored only on the clients' devices and no one, not even Viber itself, has access to them. To learn more about Viber Encryption, follow this link: http://www.viber.com/en/security-overview."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]