My mom worked at Nortel in the 1990s at their Ottawa R&D campus. As a teenager visiting, I asked about corporate espionage, hoping for a story about Cisco or something. Every one of her co-workers just belted out "China" at the same time. It was apparently an open secret that the Chinese were hoovering up IP and management didn't care. It's a bit of a shame as Nortel's telecom kit was considered top-notch (especially the cellular stuff), but it gave the Chinese an enormous amount of help catching up.
That being said, the Chinese then went off and innovated off of it and Nortel imploded, mostly due to other poor management reasons. My mom was at least smart enough to cash out most of her equity as she got them, though. Lotta people lost everything.