I want to know the answer to the following question:
Which countries signed ACTA?
All the background I'm provided with is that "The ACTA trade agreement, signed in May 2011 by the United States, Japan, Switzerland, and the EU, and which has not entered into force, requires that its parties add criminal penalties, including incarceration and fines, for copyright and trademark infringement, and obligated the parties to active police for infringement.". Is that enough to answer the question?