Garden-variety downloading opens you up to civil liability, but it doesn’t make you a criminal. You’re only a criminal if you (a) infringe for profit, (b) infringe more than $1,000 worth over a 6-month period, or (c) put a pre-release copy online.
UPDATE: To be fair to the DRM-crackers, I should note that the criminal penalties there also don’t apply unless the circumvention was for profit.