Research and Development of Digital Contents Sharing System that can Share like Library

图书馆购买一定数量的书，借给使用者。图书馆的这项业务承载着人类知识共享等文化的发展。人们有在图书馆处理数字内容（以下简称内容）的需求。但是，由于数字内容很容易被非法复制，因此不适合图书馆这样的借阅业务。在本研究中，我们实现了一个原创的图书馆业务，这也是本研究的意义所在，实现了图书馆数字化内容的共享，具体来说，我们提出了用户在使用期间可以通过网络借阅内容和无需网络连接即可查看内容的系统。本系统仅在使用期内进行检查，防止未经授权复制内容。本方案所要求的必备设备应满足以下要求：便于携带，具有普通用户无法使用的时钟和存储空间，并内置CPU。这样我们就开发了一种设备（以下简称令牌），因为它不存在。2005财政年度，为了满足令牌实机化的要求，我们开发了令牌仿真器和库系统原型。2006财政年度，我们研究开发了令牌与库服务器之间的安全通信和正确同步协议。并提出了在密码等基础上传输机密信息的方法作为使用令牌的应用实例。在2007财年，我们制作了代币原型，考虑将其批量生产为IC卡类型，并提出了在线考试系统等作为使用代币的应用实例。我们提出了一种既能维护权利人的权利，又能保证用户便利的制度：即用户可以通过网络借阅内容，并且只在不使用网络的使用期间对该制度进行检查。这一研究对于未来的内容数字化具有十分重要的意义。少

The library buys a certain number of books, and lend them to the user. This business at the library bears the development of the culture such as sharing human knowledge. People has the demand that it wants to treat digital contents (henceforth contents) at the library. However, because unauthorized copying is made easily as for digital contents, it is not suitable for the lending business like the library.In this research, we achieve an original library business that is the meaning of this research in enabling sharing the library for digital contents, Concretely, we propose the system that the user can borrow contents through the network and can inspect contents without network connection in the use period. This system can be inspected only in the use period, and the unauthorized copying of contents is prevented. A necessary equipment should meet the following requirements with this proposal: it is possible to carry, it has the clock and the storage area that the ordinary user cannot u … More se, and CPU is built into. Such we develop an equipment (hereafter, token), because it did not exist. In 2005 fiscal year, to bring a requirement to make a real machine of the token, we develop the emulator of token and the prototype of the library system In 2006 fiscal year, We researched and developed the safe protocol to communicate and correct synchronization between token and library server. Moreover, it proposed the method of transmitting the confidential information on the password etc. as an application example that used the token. In 2007 fiscal year, we made the prototype of the token that considers mass-producing it as IC card type Moreover, it proposed the online examination system etc. as an application example that used the token.We proposed the system that was able to defend right holder's right while securing convenience on the user side : it is in point that the user can borrow contents using network, and inspect only in the use period not using network about this system. It seems that this research is very important aiming at the digitalization of contents in the future. Less