The Bellevue, Wash, company announced Wednesday that it filed patent infringement complaints against companies like McAfee, Symantec Corp.

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Amazon can be expected to point to a 2009 court decision involving Veritas Software Corp, now part of Symantec Corp.

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In November, 70.5% of all email was spam, down from a recent high of 92.2% in August 2010, according to security-software maker Symantec Corp.

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