Sentence:  The volume of <WSD>unpaid</WSD> consumption in movies appears to be lower, particularly in the United States. Rob and Waldfogel (2007) report that only about 5 percent of movie consumption among University of Pennsylvania students in 2005 was <WSD>unpaid</WSD> (at a time when about half of a similar population's music consumption was <WSD>unpaid</WSD>). 
Meaning of the word marked with <WSD> tags:  Not paid for.