[{'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: a) Managing your preferences Generally, you may withdraw at any time your consent for BlackBerry to process your personal information in accordance with this Privacy Policy, subject to legal or contractual restrictions and reasonable notice. For example, although you can use BlackBerry Offerings for some purposes without providing us with any personal information, BlackBerry may need to process personal information for some services, including those that require payment or involve an ongoing relationship such as registration or subscription services. As such, BlackBerry may continue to use your personal information as may be required to provide you with requested services, and to the extent that BlackBerry is contractually obligated to do so or as necessary to enforce any contractual obligations you may have with BlackBerry. If you refuse to provide BlackBerry with the information it requires or later contact us in writing at one of the addresses above to withdraw your consent to use and disclose this information, BlackBerry may no longer be able to provide you with your BlackBerry Offerings."}, {'role': 'assistant', 'content': 'This clause is fair. The privacy practices mentioned are: nan.'}]