If the pattern was bought and designed for personal use, you can change it any way you would like. No problem... unless Canada has some strange copyright law preventing your personal use of your purchases. It's like buying a book and underlining or rewriting a sentence so that you could understand it better ... for your personal use (not for republishing). And actually, I can't see why it would be illegal to sell the pattern. There is a very large market for the reselling of used books! (Check eBay and Amazon!)... just so you don't claim it's your creation.