STOCKHOLM--(BUSINESS WIRE)--Clavister (STO:CLAV) Clavister (NASDAQ: CLAV), a leader in high-performance network security, today announced the appointment of Björn Norrbom and Ilkka Hiidenheimo to its board of directors, to assist the company in achieving further international growth. Hiidenheimo brings more than 30 years’ experience in IT business and computer security to the board, having previously founded Stonesoft Corporation, a network security solutions vendor in Finland, in 1990. Hiidenh


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