In this paper we propose a new scheme of managing resources on public devices used by private devices. Due to the advancement of wireless LAN technologies, wireless hot spots are becoming popular in the cities. In such hot spots, we can expect that public devices such as large displays and printers be available in the future as well. Assuming that these public devices are used by anonymous group of users, there are several threats of group-secret information being exposed or unintentionally left on public devices. To overcome the problems, Secure Management of PErsonalization Association (SAPEA) is introduced. SAPEA has two fundamental mechanisms: accessible-zone based and soft-state management of public devices. In particular, files which are the fundamental resources in SAPEA can be extinguished even when they are being used to avoid exposure to illegitimate users. In this paper we describe the design and implementation of SAPEA on Linux PCs with Bluetooth.