"Attention Brokerage" is one of the latest developments in the field of online advertising. The first Web-site applying the concept of selling and buying attention is Cybergold. Users, who want to earn money have to register and then look at ads, which, of course, they have to prove by e.g. downloading software. Attention, according to this idea, represents a good, which is worth being paid for.
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ISPs (Internet Service Provider), BBSs (Bulletin Board Service Operators), systems operators and other service providers (in the U.S.) can usually be hold liable for infringing activities that take place through their facilities under three theories: 1) direct liability: to establish direct infringement liability there must be some kind of a direct volitional act, 2) contributory liability: a party may be liable for contributory infringement where "... with knowledge of the infringing activity, [it] induces, causes or materially contributes to the infringing activity of another." Therefore a person must know or have reason to know that the subject matter is copyrighted and that particular uses violated copyright law. There must be a direct infringement of which the contributory infringer has knowledge, and encourages or facilitates for contributory infringement to attach, and 3) vicarious liability: a party may be vicariously liable for the infringing acts of another if it a) has the right and ability to control the infringer's acts and b) receives a direct financial benefit from the infringement. Unlike contributory infringement, knowledge is not an element of vicarious liability.