Authentication of merchandise units

1. A system for authenticating a merchandise unit, the system comprising:

a memory for storing an electronic product code obtained from the merchandise unit, the electronic product code identifying the merchandise unit; and

a sensor for detecting an attribute of a marking medium associated with the merchandise unit;

the system being configured to output data representative of the attribute and the identity of the merchandise unit.

2. The system of claim 1 , further comprising a processor for determining whether the attribute corresponds to the electronic product code.

3. The system of claim 2 , wherein the processor is configured to determine whether the attribute corresponds to a range that includes the electronic product code.

4. The system of claim 1 , wherein the sensor is configured to detect a physical property of a nucleic acid sequence.

5. The system of claim 1 , wherein the sensor comprises a fluorescence detector.

6. The system of claim 1 , further comprising a reader configured to read the electronic product code from the merchandise unit.

7. The system of claim 6 , wherein the reader comprises an RFID tag reader.

8. The system of claim 6 , wherein the reader comprises a bar code scanner.

9. A merchandise unit comprising:

a mark encoding an electronic product code that identifies the merchandise unit; and

a marking medium having an attribute that corresponds to the electronic product code.

10. The merchandise unit of claim 9 , wherein the mark comprises information encoded as a bar code.

11. The merchandise unit of claim 9 , wherein the mark comprises information encoded in an RFID tag.

12. The merchandise unit of claim 9 , wherein the marking medium comprises a fluorescent material.

13. The merchandise unit of claim 9 , wherein the marking medium comprises a nucleic acid sequence.

14. The merchandise unit of claim 9 , wherein the marking medium is associated with packaging of the unit.

15. The merchandise unit of claim 9 , wherein the marking medium is associated with labeling of the unit.

16. The merchandise unit of claim 9 , wherein the marking medium is associated with a product associated with the unit.

17. A method for evaluating authenticity of a merchandise unit, the method comprising:

reading an electronic product code from the merchandise unit;

measuring a value of an attribute associated with the merchandise unit; and

determining whether the value corresponds to the electronic product code.

18. The method of claim 17 , wherein reading an electronic product code comprises reading a bar code.

19. The method of claim 17 , wherein reading an electronic product code comprises reading an RFID tag.

20. The method of claim 17 , wherein measuring a value comprises observing a fluorescence.

21. The method of claim 17 , wherein measuring a value comprises observing a property of a nucleic acid sequence.

22. The method of claim 17 , wherein determining whether the value of the attribute corresponds to the electronic product code comprises determining whether the electronic product code is within a range of permissible electronic product codes.

23. A marking system for marking merchandise units, the marking system comprising:

a marking station having

a serial number applicator for associating an electronic product code with a merchandise unit; and

a marking medium applicator for associating a marking medium with the merchandise unit, the marking medium having an attribute that corresponds to the electronic product code associated with the merchandise unit.

24. The system of claim 23 , further comprising a processing system in data communication with the marking station for storing, for each merchandise unit marked by the marking station, data indicative of a relationship between the attribute value and the electronic product code.

25. The system of claim 24 , wherein the processing system is in data communication with the marking medium applicator over a wide area network.

26. The system of claim 23 , wherein the serial number applicator comprises an ink jet printer.

27. The system of claim 23 , wherein the marking medium applicator is configured to associate a fluorescent material with a merchandise unit.

28. The system of claim 23 , wherein the marking medium applicator is configured to associate a nucleic acid sequence with a merchandise unit.

29. The system of claim 23 , wherein the serial number applicator comprises an RFID programming unit.

30. A system comprising a plurality marking systems as recited in claim 23 , each of which is in data communication with the processing system over a wide area network.

31. A method for marking a merchandise unit, the method comprising:

associating an electronic product code with a merchandise unit;

associating a marking medium with the merchandise unit, the marking medium having an attribute that corresponds to the electronic product code associated with the merchandise unit; and

storing, for each merchandise unit marked by the marking station, data indicative of a relationship between the attribute value and the electronic product code.

32. The method of claim 31 , wherein associating an electronic product code with a merchandise unit comprises encoding the code in an RFID tag.

33. The method of claim 31 , wherein associating an electronic product code with a merchandise unit comprises printing the electronic product code on the merchandise unit.

34. The method of claim 31 , associating a marking medium with the merchandise unit comprises associating a fluorescent material with a merchandise unit.

35. The method of claim 31 , wherein associating a marking medium with the merchandise unit comprises associating a nucleic acid sequence with a merchandise unit.

36. The method of claim 31 , wherein storing data comprises transmitting the data to a storage location over a wide area network.