Zak was lead counsel in numerous precedent-setting court cases such as the
Toronto.com case (2000), wherein he successfully defended against the first attempt in Federal Court to obtain an interlocutory injunction against a domain name registrant. Zak was defence counsel in the
Sweetsuccess.com case (2001), the first decision to establish the convenient forum for international domain name disputes involving a Canadian domain name registrar. Zak was instructing counsel for the registrant of the defendant domain name in the
Technodome.com case (2002), which was the first in rem decision under the United States Anti-cybersquatting Consumer Protection Act. Zak was counsel in the first Canadian court case overturning an ICANN UDRP commenced by Molson in the
Canadian.biz case (2002). Zak was lead counsel in the
CheapTickets.ca case (2008), wherein he defended a descriptive domain name by successfully obtaining the cancelation of a plaintiff's trademark for "Cheap Tickets" in a proceeding which went all the way to the Federal Court of Appeal.
