Wikipedia has the best explanation:
Beginning in 2019, the CFL announced the two teams with the highest waiver priority will each get to make one Territorial Draft Pick (to be used to select a player born within their territorial limits at the end of the second round). The two teams that qualified for the 2019 Draft were Montreal and Toronto and these picks were made with the 17th and 18th overall picks.
This was the first time since 1984 that the league’s draft will feature territorial selections. From 1972 to 1982, each club had the right to pre-select two players from its region who would be exempted from the draft. That limit was reduced to one Draft exemption selection in 1983 and 1984, and then the practice was terminated altogether prior to the 1985 Canadian Draft.