On the internet, time is money: "But most internet content providers are not so unrealistic as to think that users will want to commit to their service for a whole year, or indeed part with such sums of money in a single transaction. Instead, what they want is a means to charge the user small amounts, content-unit by content-unit. Furthermore, such an online pay-per-view (PPV) scheme must offer the user convenience, security, and preferably, anonymity."