When the Supreme Court of Canada decision came down in 2012 interpreting fair dealing broadly to say that copying short excerpts for student instruction was permitted or was fair, we were faced—“we” being legal counsel for colleges, universities, and the Council of Ministers of Education—with a situation where we had to put some meaning around what is a short excerpt. The Supreme Court said that you can copy short excerpts for students in a class, but it didn't say anything about what short excerpts were.
There were a number of sources that guided us in developing the limits that are in the fair dealing guidelines.
On the same day that the Supreme Court decided how fair dealing should be interpreted in an education context, they issued another decision, which interpreted fair dealing for the online sale of music. In that case, they did put some numbers around the amount that could be copied under fair dealing, and in that case, it was previews. When you buy music online, you can preview it. You can listen to a piece of it. It was 30 to 90 seconds of a four-minute song. At 30 seconds out of four minutes, that's 12.5% of the musical work. That was one source.
We also were looking at case law in the United States, where, as there is here in Canada, a dispute is going on between publishers and a university about how much could be copied for the use of students. In those decisions, which have now gone up to the federal appeals court, back down on reconsideration, and back up again, with no decision yet, the threshold of 10%, or a chapter, was used many times in the court's decision, finding that this threshold was fair.