So-called "app stores" are becoming a popular means of distributing software, particularly for mobile devices. However, the rise of app stores has been accompanied by tensions with free software/open source legal norms. Companies controlling official app distribution channels for their platforms typically place restrictive terms on both users and developers in ways that may be difficult or impossible to harmonize with requirements and expectations around FLOSS licensing. Moreover, there is a perception that noncompliance with FLOSS licenses is prevalent in app store distribution. This panel will explore some of the problems arising out of the intersection between app stores and FLOSS, under EU as well as US law, and will discuss possible solutions.