Most (like nearly all) legit users who download have absolutely zero plans to share your content with others.
Rather than locking your content with DRM or only having streaming methods, focus more on making sure people with stolen credit cards and other suspicious warning signs don't sign up (easier than it sounds to enforce this) and continuously monitor user activity and take action against the small percentage of legit users who try to download way too much.
In our experience, 95+% of users don't even access 50GB a month and amongst the >4% that do access more, only a fraction of that percent enters 'cutting losses by terminating their subscription' territory.
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