Dispute over intellectual property led to sabotage, sources tell Reuters.
Former staff at Kaspersky Lab have accused the Russian security firm of damaging rivals by tricking programs into misclassifying core software files as malicious.
Microsoft, AVG and Avast were among those said to have been targeted by the software vendor in a bid to make them disable vital files on customers' machines, after the group's founder Eugene Kasperskybecame convinced rivals were copying his technology.
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