I have probably spent more time dealing with the implications and real-world scenarios of copyleft in the embedded device space than anyone. I'm one of a very few people charged with the task of enforcing the GPL for Linux, and it's been well-known for a decade that GPL violations on Linux occur most often in embedded devices such as mobile hand-held computers (aka “phones”) and other such devices.
This experience has left me wondering if I should laugh or cry at the news coverage and pundit FUD that has quickly come forth from Google's decision to move from the Apache-licensed Java implementation to the JDK available from Oracle.