DILOM from in-the-money PUT

It is briefly said both in CFAI and schwasser that it is possible to calculate DILOM from a put option. Unfortunately there is almost nothing about the method in the internet. Does anybody know how to actually make this computation, any guidance or an example? How do u calculate DILOM in absence of comparable data?

Whats a DILOM?

discount for lack of marketability

Hey bud - google protective put DLOM