I downloaded the digital copy DVDs to my computer. About a year later the hard drive crashed and I lost all my data.
After replacing the hard drive, I was able to re-download all the iTunes purchases except I could not restore my digital DVD copies from iTunes. When I try to copy again from the DVD, it reads "this code has already been used. codes can only be used once." Even though I am logged in with my Apple ID, which should be linked to the code that was used and I am on an authorized computer.
It seems I should be able to restore the digital copies to my computer even though they are single-use codes...
iPod touch (4th generation), Windows Vista