The present invention provides systems and methods for secure transaction management and electronic rights protection. The filter insert is configured such that the air can easily flow into or out of the structural space on the one side of the filter element with a minimum pressure drop. Each node can store a volume of the striped volume set. The committee prioritizes the action issues and sends resolution directions for each action issue to the customer andor a manufacturer. Because each edge contains an edge mask to indicate whether it connects to a particular source or destination point, the timing analysis tool does not analyze areas of the graph that do not lead to a relevant source or destination point. The apparatus includes an accumulator capacitor coupled at one end to a voltage measurement circuit and at the other end to the receive electrode, and control circuitry configured and arranged, during each cycle of a measurement sequence, to connect a reference voltage to a first node that electrically connects the accumulator capacitor to the voltage measurement circuit.