  One of major considerations in an online business is customer privacy.
Consumers are not interested in being monitored and identified by sellers. Some
solutions are proposed to hide selection of the customer but in the payment
phase, there will be a leakage of information as online shopper can infer some
information about customer's preference due to the price, which is paid by
customer. This is a big threat to customer privacy. Our solution to this
problem consists of a number of one-unit payment steps that cannot be linked to
each other or to customer's identity. At the end of purchase, content provider
will receive appropriate amount of money while customer will acquire a valid
license anonymously. Content provider will not be able to gain any information
about the customer or the content that is purchased. In addition, a dispute
resolution scheme is presented for cases of conflict between customer and
content provider. A series of analyses on the security, complexity and DRM
requirements are presented which indicate security and practicality of our
scheme.
