These strategies have taken place in the past with GMOs, and I suspect will happen again.
Branded seed sowing can be subject to some restrictions for a single contract and crop for the purpose of the destination of the produce, but the extent of those restrictions should stop there and should not apply to 2nd generation seeds or their crops.
I've had my share of shady contracts with 10 year long confidentiality agreements. Never again.
Indian farmers have all my sympathy and support.