Freedom of the press is protected under section 2(b) of Canadian Charter on Rights and Freedoms as part of the Constitution Act of 1982: “Everyone has the following fundamental freedoms: • (a) freedom of conscience and religion; • (b) freedom of thought, belief, opinion and expression, including freedom of the press and other media of communication; • (c) freedom of peaceful assembly; and • (d) freedom of association.”

References:

Constitution Act of 1982: https://laws-lois.justice.gc.ca/pdf/const_e.pdf