We are not looking for IPR, but they are preventing us from replacing their alloys with ours which can improve thrust and SFC. Unlike the F414 deal with 100% production tech, we don't have the same for AL-31FP. We produce something like 87% of the engine's total components. They are using IPR protection as an excuse instead.
Our localized tech has significantly improved the AL-31FP but I doubt we can use it without massive investment, basically pay even more for ToT, like what did for the T-90. But the engine is a major source of revenue for them. The Russians say replacing the alloys with Indian ones will void the warranty. Them being so hard-headed is probably why we are not interested in the AL-41F1S.
As for AL-51F, they are willing to sign the same deal as AL-31FP, but after FGFA has finished development and a production agreement is signed for a sizable number. So all that will take 15-20 years to arrive. Even a basic license production deal for an MKIzed Su-57 will take many years before we get to phase 4 production. So this engine will not help develop HAL's production capabilities.
I had once proposed buying 2-3 squadrons of Su-57 on the condition that we can do whatever we want with the MKI's engine, but even if the Russians agree, this still requires us buying the Su-57 anyway. But it's better to risk things with 40-60 jets than with 270.
So the Russians aren't an option to achieve our engine dreams quickly. F414 is the only way. Deliveries will begin in 3 years we will have all the necessary production tech by 2030-31. The goal is to build 100% of the engine using 100% of Indian raw materials eventually.