If you don't need to know it, don't ask or store it
Privacy Infrastructure
TOR exit nodes
VPNs
"Arguing that you don’t care about the right to privacy because you have nothing to hide is no different than saying you don’t care about free speech because you have nothing to say."
Subtitle
Edward Snowden
Further Reading
Adam Chandler, "Patron Privacy in a Surveillance State," https://ecommons.cornell.edu/handle/1813/36316
Mike Robinson, "Library Privacy & Commercial Surveillance"
http://www.consortiumlibrary.org/blogs/mcrobinson
/files/2016/04/patron_privacy_pla.pdf
Soshana Zuboff, "The Secrets of Surveillance Capitalism," http://www.faz.net/aktuell/feuilleton/debatten/the-digital-debate/shoshana-zuboff-secrets-of-surveillance-capitalism-14103616-p2.html