Finding a Choice in a Haystack: Automatic Extraction of Opt-Out Statements from Privacy Policy Text. - Vinayshekhar Bannihatti Kumar; Roger Iyengar; Namita Nisal; Yuanyuan Feng; Hana Habib; Peter Story; Sushain Cherivirala; Margaret Hagan; Lorrie Faith Cranor; Shomir Wilson; Florian Schaub; Norman M. Sadeh (WWW, 2020)