Computer surveillance is when a user monitors the activity taking place on a particular PC. Information on the hard drive, as well as searches on the Internet, are often tracked as part of this process. There are a number of computer surveillance programs available on the market today.

Internet surveillance is performed by intercepting 'packets'. This in information that is sent from either your computer, or the server that you are communicating with. This information can be intercepted and seen by whomever is performing the surveillance.

Computer surveillance is the act of monitoring computer activity and data being transmitted over the internet. The Federal government can use this for security measures against terrorists and corporations use it as a form of business intelligence

Surveillance is the monitoring of the behavior, activities, or other changing information, usually of the people for the purpose of influencing, managing, directing, or protecting. The various forms of counter surveillance are - computer surveillance, telephones, surveillance cameras, social network analysis, biometric surveillance, aerial surveillance, data mining and profiling, corporate surveillance, human operatives, satellite imagery and identification and credentials.

Depending on your state's laws, using a computer surveillance system should be admissible in court. However, make sure there's a time stamp and that the footage could not be challenged as tampered with.