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I would suspect this applies:
From: http://www.tilma.ca/pdf/TILMA_Agreement_April2009.pdf
PART V
EXCEPTIONS TO THE AGREEMENT
BOTH PARTIES
Forests, Fish and Wildlife
1. Measures adopted or maintained relating to:
( a ) the licensing, certification, registration, leasing or other disposition of rights
to the harvesting of forest or fish resources;
( b ) the management or conservation of forests, fish and wildlife; or
( c ) requirements that timber be used or manufactured within the territory of a
Party.