It seems like if this is upheld not only would it mean that one can not delete files from one's PC but that there would be other issues at stake.

For example, I know that in many network environments at colleges and universities its common that every time a computer is rebooted its changed back to a default image to remove any spy ware, viruses, or just programs that users may have installed on the computers while they were using the computer.

Additionally, this would mean that if I format and reinstall my registry is cleared... so that could become a DMCA violation.

Editing a registry entry is not copyright circumvention, nor is reinstalling or restoring to an image. If they want to limit the number of coupons that someone prints out they can tie the coupons to the individual's real name verified by a credit card and require an account log-in. It might turn some people off to the service, but it is a much better way then using the registry to assign a unique identifier to individuals. If they decide not to do this because they want to distribute more coupons that is risk they take due to doing business in an unsecured manner.