Copy Protection Code

We are evolving our copy protection system. A system of ‘Challenge and Response’ type. Currently we are only using the MAC address to create the Response code. We are now trying to find additional “unique?? codes to use to identify the individual computers. ## Deliverables We are evolving our copy protection system. A system of ‘Challenge and Response’ type. Currently we are only using the MAC address to create the Response code. This has been a bit cumbersome and prone to errors so we are now trying to find additional “unique?? codes to use to identify the individual computers. We need source code that enables us to extract as many different codes as possible. Since this is an integral part of our C/P system the code must be written in a way that will work on all PC’s. BIOS serial? Harddrive serial? Motherboard? We need you help to tell us what is possible so do not limit the list to the above. Operating System: Windows XP, Vista, 7 Language: C++