Originally Posted by theDreamer

He is technically right, no one can enter his account, but there are far worse things than that.
Depending on US/Canada laws between the two countries, you can put a lien against all his accounts (and name), his property, etc. This screws him on any money he makes in the future, meaning if he gets paid the money is redirected from his account to pay off the lien.

Also, if your lawyer wants to pursue it you can bring criminal charges against him, both in Canada and the US. Look into filing with other US/Canada agencies to add him to a wanted list, if he tries to go in/out of either country he will be detained and arrested.

Sure, let him keep his money in his account, but you can own his life, much more enjoyable to destroy him.