I don't remember countries ever researching computers.
Dude it was always inevitable for them to be released to the public (which I assume you already have) and have them spread to other countries. Ideas cannot be kept. Ways to make computers cannot be kept. This is exactly what happened in the computer revolution.
Besides, Canada has been researching the computer chip for some time now alongside UNP. I doubt that no one in Canada would have made a mimic of UNP tech or Canadian tech. Computers are an idea, not a super secret patented item that a country can shield.