Methods and systems are offered to create, eliminate and/or modify trade channels. These can utilize a variety of communication media, including computer networks and the network of interconnected machines known as the Internet.

Los métodos y los sistemas se ofrecen para crear, para eliminar y/o para modificar los canales comerciales. Éstos pueden utilizar una variedad de medios de comunicación, incluyendo las redes de ordenadores y la red de las máquinas interconectadas conocidas como el Internet.

 
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> System for prepayment of electronic content using removable media and for prevention of unauthorized copying of same

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