Having been playing CMOS Semiconductor games for almost a decade, I'd say it won't be direct licensed tech (cut and paste). Canon would need to reproduce Sony process and probably "promise" not to use it on other chips. You can buy IP for various parts, but that's on pre-existing common processes. Canon have thier own process and I bet it's nothing like Sonys.
What Canon might have done is to license particular technique(s) (patents) that Sony use that makes their sensors "exmor", a bit like a patent swap, but that doens't mean canon would have been told how to do it, merely that they won't be prosecuted by copying Sony tricks.
Anyway I voted 100% Canon. I'm pretty sure Canon will have worked out how the Exmor chips work without Sonys help, the trick will be copying without infringing patents.