такое впечатление, что в тексте опечатка

d. Whether the countries’ International Investment Agreements grant protection to activities which have an effect similar to expropriation (protection against indirect expropriation

по смыслу должно быть - grant protection *against* activities which have an effect similar to expropriation

такие меры обычно и называют "indirect expropriation"
("The measures taken by the State have a similar effect to
expropriation .....and are generally termed “indirect”, “creeping”, or “de facto” expropriation")

права ли я?

спасибо

заказчику надо будет указать на это

* 'to grant protection to activities' (to enable them to take place), or
* 'to grant protection against activities' (to protect s.o. against them taking place),

as both are grammatically correct. Whether it should be 'to' here or 'against', depends purely on your Agreement and what it's trying to achieve – whether it views activities such as expropriation as a positive (desirable) thing, or a negative (undesirable) thing.

However, if you look up International investment agreement in Wikipedia (http://en.wikipedia.org/wiki/International_investment_agreement) and search through it for the word 'expropriation', you'll find that it says:

"Provisions on compensation for losses incurred by foreign investors as a result of expropriation or due to war and strife usually also form a core part of [international investment agreements and similar agreements]."

This suggests that, as you say, your text should read 'protection against' and not 'protection to'.