As growing more global economic activities, both sales figures and brand protection are great concerns for international enterprises. To protect the brand, various kinds of security devices have been used. It is, however, difficult to evaluate these security devices. One of the major reasons of this difficulty is based on the fact that properties of the security devices are quite hard to be quantified. Accessing costs of the devices is one of the barriers in the evaluations when a neutral person wants to evaluate the devices. Moreover, detailed specifications of the devices are often kept secret because of the devices' basic characteristic: “security.” Several projects to establish security evaluation methods, such as CC (Common Criteria) and its derivative standard ISO/IEC 15408, are energetically proceeded, and however mainly focused on security of information and entities who address the information as their scopes. In this paper, we assume a distribution model of branded products to discuss properties of security devices. Then, we propose a simple classification method of the devices on the assumed model. In the proposed method, we classify security devices without quantifying any properties. We also discuss how to utilize the proposed classification method effectively. Users of security devices can reduce research costs by examining only preselected devices in detail after the class-selection.