this is ez to do
make a .htaccess file
now theres 2 ways of doing it
1. by allowing only candian ips, i dont know what the starting number is but this is what it is for my country
allow from 203...
allow from 210...
or
2. only allow canadian domains, only problem with this is some isps in canada may have .com or .net
but this is how u would do it for my country
allow from co.nz
allow from net.nz
i think thats right