The short- and long-term effectiveness of anti-piracy laws and enforcement actions

Film studios have spent the past two decades lobbying extensively to establish new legislation restricting access to copyrighted materials online. While there is growing evidence of the effect film piracy has on studio profits, the evidence on the impact of anti-piracy legislation is limited. If anti-piracy legislation is having the film industry's desired impact, we would expect film revenues to be consistently higher following the passage of major laws that restrict access to pirated content, or major enforcement actions, such as the shutdown of Web sites that provide illegal content for download. This paper applies an intervention analysis approach to weekly data on movie box-office revenues in the USA to determine whether the passage of new anti-piracy policy has generated significant changes in box-office revenues during the period from 1997 to the present. These effects are evaluated in both the short and long term, which allows an assessment of the duration of effectiveness of government actions. The results show that four of the six included policies are ineffective in the long term and those policies that do impact revenues in the short term often harm film studios, rather than help them.