With F35 same problem, if they are not ready to give IP rights then we should not go in sea with them. If no one gives you the tech, you should understand that ther is no other way then you have to start and begin with the engine yourself.
I remember that our navy was looking for something like P8 poseidon. If Tusas is capable to turn a boeing or airbus airplane in to something like the p8 why not.
We are talking about billions dollar of equipments and in return for 125 million dollar? F35 will be not for free, in the end they will have to pay for it.