Official Rules:

The prize for the Visible Body Atlas Give-Away is a code allowing the winner to activate a one-month, time-limited download of either Human Anatomy Atlas for PC or Mac, Muscle Premium 2 for PC or Mac, or Heart & Circulatory Premium 2 for PC or Mac, each with a retail value of $14.95.

Use of the prize is subject to Visible Body's privacy policy and the Human Anatomy Atlas End User License Agreement.

The prize may be transferred or assigned to a third party if the winner already subscribes to or owns the product, or for any other reason.

Winners will be notified via the e-mail address they gave for the Visible Body e-mail newsletter, and will have the code for accessing the prize delivered to them via that same e-mail address.

An entrant can win just once.

Entrants may not enter multiple times using multiple email addresses.

Newsletter subscribers can opt out of the sweepstakes by sending an e-mail from their address on record to atlasgiveaway@visiblebody.com with the subject line "Remove my name from prize consideration." Ten winners will be randomly drawn from all newsletter subscribers every Friday.

Entrants who discontinue their newsletter subscription will be removed from the pool.

The odds of winning depend on the number of entries at any given time. Visible Body has the right to cancel, modify, or suspend the sweepstakes at any time.