Canada Anti-Spam Legislation (CASL) is a law that was enacted to protect Canadians from spam and other electronic threats. It came into effect on July 1, 2014, and applies to all commercial electronic messages (CEMs) sent to or from Canadian computers and devices. CASL is designed to deter damaging and deceptive forms of spam, such as identity theft, phishing, and the spread of spyware and malware.