This paper investigates how smart devices covertly capture private conversations and discusses in more in-depth the implications of this for youth privacy. Using a structured review guided by the PRISMA methodology, the analysis focuses on privacy concerns, data capture methods, data storage and sharing practices, and proposed technical mitigations. To structure and synthesize findings, we introduce the SCOUR framework, encompassing Surveillance mechanisms, Consent and awareness, Operational data flow, Usage and exploitation, and Regulatory and technical safeguards. Findings reveal that smart devices have been covertly capturing personal data, especially with smart toys and voice-activated smart gadgets built for youth. These issues are worsened by unclear data collection practices and insufficient transparency in smart device applications. Balancing privacy and utility in smart devices is crucial, as youth are becoming more aware of privacy breaches and value their personal data more. Strategies to improve regulatory and technical safeguards are also provided. The review identifies research gaps and suggests future directions. The limitations of this literature review are also explained. The findings have significant implications for policy development and the transparency of data collection for smart devices.

翻译：本文研究了智能设备如何隐蔽地捕捉私人对话，并深入探讨了这对青少年隐私的影响。通过采用PRISMA方法指导的结构化综述，分析聚焦于隐私关切、数据捕获方法、数据存储与共享实践以及提出的技术缓解措施。为系统整合研究结果，我们引入了SCOUR框架，涵盖监控机制、知情同意与意识、操作数据流、使用与利用、以及监管与技术保障。研究发现，智能设备一直在隐蔽地收集个人数据，尤其是针对青少年设计的智能玩具和语音激活智能设备。这些问题因不明确的数据收集实践和智能设备应用透明度不足而加剧。在智能设备中平衡隐私与实用性至关重要，因为青少年对隐私侵犯的意识日益增强，并更加重视个人数据。本文还提供了加强监管与技术保障的策略。综述识别了研究空白并提出了未来方向，同时说明了本文献综述的局限性。研究结果对智能设备数据收集的政策制定和透明度具有重要启示。