These included established products such as programs to identify and screen out hostile programs such as worms and viruses from stored and transmitted data and barrier products such as firewall software.
它们包括一些定型的产品，如用于从存储和传输的数据中识别和筛选出恶意程序如蠕虫和病毒的程序等，还有一些阻挡产品，如防火墙软件等。