Security
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Nonrepudiation is a method of proving either that a user performed an action (such as enrolling in a stock plan or applying for a car loan), or that the user sent or received some information at a particular time. This prevents the individual from fraudulently reneging on a transaction. By comparison, if you purchase an item, you might have to sign for the item upon receipt. If you decide to renege on the deal, the vendor can simply show you the signed receipt.
A comprehensive nonrepudiation plan usually requires authentication, authorization, data integrity, and auditing. In addition, nonrepudiation requires a message on the Web page, warning that the action the user is about to take is legally binding. This does not make the Web server more secure, but it does make Web transactions (such as purchasing an item) more secure.
Today, electronic nonrepudiation across the Internet is new and there is little in the way of legal precedent. This is sure to change as more business is performed across the Web.