For many consumers, the restrictions that companies put on what they can do with their digital content, whether it be music, video clips or pictures, are akin to stipulating that a book you purchase can only be read in your house and cannot be loaned to a friend.For the producers who make that content or companies like Microsoft who restrict access to it with technology called digital rights management, or DRM, guaranteeing that the content cannot be illegally copied is fundamental for encouraging the creation of songs and videos that people want to buy. These competing views have been tussling for years over digital content on computers – only now the battlefield has moved to the cellphone.
http://iht.com/articles/2007/08/06/technology/web-wireless.php