A flexible security system for using Internet content

The Internet and World Wide Web have introduced a powerful new way to acquire content. Previously, users had to either buy or order content on coded disks. They can now download executable code and applications directly. From the users´ viewpoint, this decreases the amount of software stored on their machines. It also lets content providers customize applications by combining different vendors´ content. Downloading content from the Internet brings risks: content that appears reputable may be malicious, given system access it can damage or destroy data. To contend with this risk, the author developed FlexxGuard, a flexible interpreter that dynamically derives protection domains and uses those domains to authorize content operations