The deal will give Tumbleweed the rights to Corvigo's technology and access to more than 20 distributors across the US.
Corvigo is best known for its Linux-based anti-spam appliances, which Tumbleweed said would add to its range of secure internet messaging applications.
Under the deal, Tumbleweed will paid $3 million in cash and issued 4.7 million shares to acquire the Palo Alto-based company.
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