Thanks, Sandy. Crown Copyright is applicable.
See "Crown Copyright and Licensing," and a discussion of Copyright and Crown Copyright- http://publications.gc.ca/helpAndInfo/cc-dac/general-e.html

Section 12 of the Copyright Act is the legal instrument governing Crown Copyright.
"12. Without prejudice to any rights or privileges of the Crown, where any work is, or has been, prepared or published by or under the direction or control of Her Majesty or any government department, the copyright in the work, subject to any agreement with the author, belong to Her Majesty and in that case shall continue for the remainder of the calendar year of the first publication of the work and for a period of fifty years following the end of that calendar year [S. C. 1993, c.44, s.60(1)."

A new publication on possible copyright changes has just been issued by the Government of Canada-
"An Act to Amend the Copyright Act." Public Works and Government Services Canada. Publishing and Depository Services, Ottawa K1A 0S5, telephone 1-800-635-7943 (North America only). Cost $16.00 Canadian.
June 12, 2008, Issued by House of Commons, 64 pages.

I have not seen a copy of this proposal, but I have been told that the '50-year' provision for Crown Copyright will be extended to 70 years. A library near you should help with copies of Acts and proposed Acts.