Symantec has increased the price of its Norton internet security products by up to a third for existing users.
The raised prices affect antivirus protection, personal firewalls and other software sold to individual users on an annual subscription basis, and cover regular online updates to the software to keep up with threats.
Symantec recently co-operated in a European Commission investigation into the security software market. Companies like Symantec are concerned about Microsoft’s entry into the market with its Windows-bundled security solutions, many of which are to appear next year.
Microsoft already bundles a free personal firewall with its Windows XP software and is planning to launch a new paid-for anti-virus service next year.