But if you believe that DRM which "prevents a user from using or accessing something for which he or she has paid for, at any time in the future for any reason,

But if you believe that DRM which "prevents a user from using or accessing something for which he or she has paid for, at any time in the future for any reason, is unethical and legally dubious," why don't you believe the same about nonfree software programs that meet the quoted criteria? Or are you saying proprietary software is okay if and only if its license is not enforced? Actually, the more I think about that the more I think I agree with it.