he TV screen to a handheld terminal, where the quality is impacted from the screen dimension). Similar transitions can be done for the online transmission of a football match or of a news program, all of which can be watched on television or by using a handheld mobile terminal. 2.1.4 Prices Fall and Overall Market Scenario At the conclusion of this very rapid analysis of the services delivered by a telecommunica- tion carrier, it is evident that the Internet revolution followed by the penetration of broad- band access has generated a big service differentiation and multiplication. At first, it could seem that telecom carriers must have had a steady increase in revenue, in pace with the increase of the average bandwidth used by the end customer. The reality is completely different. As a matter fact, when the Internet revolution started, the "network," as almost all Internet users call it, was seen as a real social revolution. In contrast with the traditional news and entertainment media, the Internet was not broadcasting contents controlled by a small number of entities, but allowed every single user to become a content generator, to publish its photos and films to entertain friends, to comment on political events, or to exchange recipes. Telecommunication Networks Many people around the world consider the Internet the most powerful instrument to affirm intellectual freedom, to diffuse news that is not in line with the thinking of the local government, and, in general, to react against authority control of information. However, in order to unleash all this power, two conditions are needed: The Internet would have to reach almost all users in the world with a sufficiently wide bandwidth, and the cost of the Internet would have to be almost zero. At the end, if the cost is related to the fruition of some content, when the content is sim- ply exchanged among users, it seems reasonable that it is done almost for free, exactly like the exchange of DVDs among friends during a Sunday meeting. However, this wonderful idea