From a skim, it looks like their main point is that with 8 movie ratings, it's trivial to link two datasets (eg anonymized Netflix rating to public IMDb profile

From a skim, it looks like their main point is that with 8 movie ratings, it's trivial to link two datasets (eg anonymized Netflix rating to public IMDb profile). https://scholar.google.com/citations?view_op=view_citation&hl=en&user=rejZUEkAAAAJ&citation_for_view=rejZUEkAAAAJ:u-x6o8ySG0sC https://scholar.google.com/citations?view_op=view_citation&h... https://systems.cs.columbia.edu/private-systems-class/papers/Narayanan2008Robust.pdf https://systems.cs.columbia.edu/private-systems-class/papers...