The term “opting in” suggests a matter of choice. But as the thoughtful and spirited documentary “Terms and Conditions May Apply” makes chillingly clear, choices are few for netizens. It’s nearly impossible to function online without signing away privacy rights and basic protections. Sounding an alarm about those ubiquitous “I Agree” check boxes and the legalese that nobody has time to read, the film examines the many ways that typical Digital Age contracts are anything but free for the user.