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.