Abstract: In accordance with the techniques disclosed herein, a system and method remove undesirable content from original data. A unit of code interpretable to display a unit of content can be replaced with replacement code interpretable to display an alternative unit of content, or no content at all. Advantageously, a user need not view undesirable content. For example, advertisements included in a web page can be removed and/or replaced.

Abstract: In accordance with techniques disclosed herein, a system and method to set prices for advertising are disclosed. Individuals rate the unit of content by expressing experiences with the content numerically. Purchases of the advertising space alter the pricing of the advertising space to reflect demand for the advertising space. The price may be raised to reflect the current price of the advertising space. A number of views of the unit of content affect the price of the advertising space displaying the unit of content. Where content is not used for a period of time, the non-use may decrease the price of the advertising space.