In the future, autonomous robots equipped with artificial intelligence (AI) will become more widespread in our society. These emerging technologies are driving the consideration of not only improvements in the development of their industrial use, but also further research into the ethical and legal issues. For example, robot acquisition of data in the form of 'life-logs' may lead to data confidentiality issues which we are not able to solve by focusing solely on AI data acquisition issues. A life-log is a comprehensive archive of personal, everyday life which is collected by computing technologies. This information is sometimes used for business purposes, such as online behavioural advertising. However, the meaning of the term life-log is vague. Similarly, the distinction between Personally Identifiable Information (PII) and Non-Personally Identifiable Information (non-PII) is not clear. In this paper, I detail and explain the current and complete range of legal accountability issues related to the collection of data for constructing a life-log. I propose a method for managing legal responsibility when life-logs are created and then used by others, whether they are individuals or organisations. Finally, I indicate the need to both clarify and streamline any future regulations related to life-logs.