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Chinese officials no longer approve the use of the two antivirus software vendors, according to reports.
Security software maker says it paid nothing and there were no settlement agreement with the patent assertion entity, commonly known as a patent troll.
Symantec's widely used and much maligned line of Norton security suites will get a major overhaul in September.
Chinese antitrust regulators also raided the offices of IT firm Accenture, one of the software giant's consulting partners.
Microsoft no longer supports XP users, but a host of antivirus products tested by AV-Test can still defend you from viruses.
Police and security firms team up to take down the notorious Shylock, a dangerous financial Trojan that has infected at least 30,000 Windows computers worldwide.
Government and business are under constant cyber attack and must learn to "take the hit," says the director of a new cybersecurity training programme.
Google's hard stance against Chrome extensions for Windows hosted outside the Chrome Web Store angers some businesses and their customers.
A new antivirus update from Kaspersky disables Internet connectivity, forcing the company to push out a fix and a workaround.
Adobe and Microsoft patch a critical zero-day security flaw in Adobe's Flash Player that is actively being used to target Windows users, but the bug is different from an unpatched hole in Internet Explorer.