In 1993, the European Patent Office (EPO) granted Canon K.K. of Japan owns a patent on charging a fee per a unit of decoded information. The main claim covers all systems where a local application decodes information received from remote information distributor and calculates a fee based on the amount of information decoded. If an information vendor wants to realise a full "Pay Per Use" system where the fee arises only when the user actually reads the information (rather than when it is transmitted), he might want to beg Canon for a license. Perhaps Canon will be generous, since it is clear that the patent claim describes a class of programs for computers (computer-implemented calculation rules), and the supposedly novel and inventive problem solution (invention) consists in nothing but the program [ as such ]. All features of this claim belong to the field of data processing by means of generic computer equipment.