URL filtering
Blocking unwanted sites by their web address
Anti-malware
Anti-spyware
Anti-virus
Behaviour blocker
Blacklist
CAPTCHA
Challenge-response
Content filtering
Demilitarized Zone
Encryption
Firewall
Heuristics
Intrusion detection system
Intrusion prevention system
Layered defence
OCR
On-access scanning
Patch
Patch Tuesday
Public Key Cryptography
Service pack
Spam filter
Walled garden
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See also
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Resources
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