Every computer needs protection, and today’s a good day to tighten up security on a bunch of your PCs. Amazon's selling McAfee's superb Total Protection suite for $20 as one of its deeply discounted daily deals. The download code covers up to five devices for a year, and the sale price ends Thursday night just before midnight Pacific time. If you’d rather get your activation codes on paper, you can get a card via mail for the same price.

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