1. Hiskey, D.: How the word “Spam” came to mean “Junk Message” (2010).
http://www.todayifoundout.com/index.php/2010/09/
2. European Parliament and the Council: Directive 2003/58/EC (2003). OJ L 221
3. Ministry of Justice of Canada: S.C. 2010, c.23. An Act to Promote the Efficiency and Adaptability of the Canadian Economy by Regulating Certain Activities That Discourage Reliance on Electronic Means of Carrying Out Commercial Activities, and to the Canadian Radio-Television and Telecommunications Commission Act, the Competition Act, the Personal Information Protection and Electronic Documents Act and the Telecommunications Act (2010)
4. Congress, U.S.: Controlling the assault of non-solicited pornography and marketing act. (CAN-SPAM Act) (2003)
5. O’Gorman, B., Wueest, C., O’Brien, D., Cleary, G., Lau, H., Power, J., M., C., Cox, O., Wood, P., Wallace, S.: Internet security threat report. Technical Report, Symantec (2019)