Indicators produced by Symantec Corporation, which measures illegal activity worldwide via more than 40,000 sensors placed in home and corporate computers, show that illegal Internet activity has increased recently (top graph).

• 赛门铁克公司透过装在一般家庭或公司电脑的四万多个感应器来测量全球的非法活动，并据此提出数个指标，显示非法的网路活动在近来有增加的趋势（请见下方的上图）。