[paulckennedy]

That is best when the advertising is static but an eBook can be for sale for years. I would expect the advertising to be timed to the point of sale. I could see Amazon and others enabling ads to be inserted by the device at the time of reading. In that event, the ereader would keep an inventory of ads for insertion at the time of reading. The eBook purchase would have as part of the DRM the ability to turn on/off ad insertion depending on the type of sale. The ads would be rotated in to the book according to the rules applied during the initial formatting as to type, kind, etc.