A user's ownership perception of virtual objects, such as cloud files, is generally uncertain. Is this valid for streaming platforms featuring accounts designed for sharing (DS)? We observe sharing practices within DS accounts of streaming platforms and identify their ownership characteristics and unexpected complications through two mixed-method studies. Casual and Cost-splitting are the two sharing practices identified. The owner is the sole payer for the account in the former, whereas profile holders split the cost in the latter. We distinguish two types of ownership in each practice -- Primary and Dual. In Primary ownership, the account owner has the power to allow others to use the account; in Dual ownership, Primary ownership appears in conjunction with joint ownership, notably displaying asymmetric ownership perceptions among users. Conflicts arise when the sharing agreements collapse. Therefore, we propose design recommendations that bridge ownership differences based on sharing practices of DS accounts.

翻译：用户对虚拟对象（如云文件）的所有权感知通常不明确。这一现象是否适用于流媒体平台中专门为共享设计的账户？我们通过两项混合方法研究，观察了流媒体平台共享设计账户内的共享实践，并识别其所有权特征及意外并发症。我们识别出两种共享实践：随意共享与成本分摊。在前者中，账户所有者是唯一的付款人；而在后者中，子账户持有者共同分摊费用。我们在每种实践中区分了两种所有权类型——初级所有权与双重所有权。在初级所有权中，账户所有者拥有允许他人使用账户的权力；而在双重所有权中，初级所有权与共同所有权并存，用户之间呈现出显著的非对称所有权感知。当共享协议破裂时，冲突便会发生。因此，我们基于共享设计账户的共享实践，提出了弥合所有权差异的设计建议。