They offer to protect your computer against known exploits, blocking attacks as they happen.
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Provide advice to governments on how to protect their computer systems and track down and arrest hackers.
And just about every technical countermeasure that brilliant engineers devised to protect vital computer systems and valuable information can be accidentally or intentionally circumvented by human interaction.
That system is widely used to protect critical computer networks.
Recent high profile data breaches, corporate economic espionage cases and government reports detailing the threat posed by foreign economic espionage in cyberspace have generated more focus on the risks posed by cyber incidents and whether corporations are doing enough to protect their computer systems and intellectual property.
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The array of technical countermeasures available to protect information and computer systems has certainly expanded dramatically over the last decade.
They can also invest in other tools like AirDefense Personal, software which sits on a laptop computer and helps protect data when a worker is using his computer wirelessly while traveling.
Companies can adopt lawful policies relating to computer use to protect the assets, reputation, and productivity of a business and to ensure compliance with legitimate corporate policies.
In the government's friend-of-the-court brief, Justice Department lawyers argued that a provision of the Audio Home Recording Act does not protect Napster because the home computer is not a "recording device" as defined in the statute.
Graham Cluley, a computer security expert from net security company Sophos, told the BBC that there were ways for computer owners to protect their machines from this type of fraud - for instance, by using up-to-date anti-virus software.
There are three main things you need to do to protect your system and stop your computer from becoming part of a botnet.
White House homeland security adviser John Brennan last month said the White House was exploring whether to issue an executive order to protect the nation's critical computer infrastructure, but gave no details on the timing or possible content of such an order.
Narayanan, who was not involved in the lawsuit, currently works developing techniques that will protect privacy while allowing the sorts of computer research Netflix was interested in.
At 3 a.m. he gave the order to abandon the embassy building because there were Twitter feeds saying an attack was coming, and he told stories like that of the embassy nurse who started "smashing computer hard drives with an ax" to protect classified information.
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She says this could help protect businesses against legal retaliation from workers who were dismissed for inappropriate computer use and claim they weren't told about the surveillance in advance.
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Public corporations have a duty to their shareholders to protect themselves or face the financial, legal and reputational harm that a computer security breach would cause.
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Digital output helps protect against radio and electromagnetic interference, which can cause audio problems with microphones mounted on computer displays.
And his efforts to combat the invasion of these viruses, in order to protect its reputation, led Talpes to refocus his company, dubbed Bitdefender, on protecting enterprises from computer hackers in 1996.
The protect part means the PC maker plans to defend its traditional strengths, such as its China business and corporate computer Thinkpad brand.
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