Digital River is a real company. They partner with other companies to handle financial transactions. Here is part of a post on the FAQ section of the Crucial.com website describing what Digital river does: "Do I have to pay sales tax: We are required to collect sales tax in the states where our partner, Digital River, has a business presence. If your order is being shipped to one of these states, it will include sales tax. Any sales tax to be charged will be indicated once your billing and shipping addresses have been entered during checkout. If you are tax-exempt entity, you can select it on the Billing page during the order process and upload your valid tax exemption certificate. When your tax exemption certification has been validated, sales tax will be removed from your order. In the event that your order does not qualify for tax exemption, we will not be able to remove applicable tax from the order."
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