What if there was a law that any device containing embedded software would have to either be (a) open source, with source code and docs freely available, or (b)

What if there was a law that any device containing embedded software would have to either be (a) open source, with source code and docs freely available, or (b) closed source, with source code and docs in escrow in the event that the manufacturer ceases support, at which time the code and docs would immediately become open source?