A positioning system receiver that mitigates narrowband interference by dynamically choosing the mitigation technique that yields the best interference mitigation capability with the least signal degradation to maximize receiver performance parameters such as receiver sensitivity, multipath resolution, and low power. The system is for use with dispensable products, more particularly for use with roasted whole-bean coffee in any retailing application, to extend shelf life of the product. The server associates the resource with the plurality of access rights via a rights markup language.