@Chhote Lal Ji
May be they are following some of the financial IT companies(indian also) model eventually, like restrictions on trading certain securities, trading during blackout periods, pre-clearance for trades.
May be prevent to prevent conflicts of interest and insider trading.
Ex: In my company we have many restrictions, because we get to results or big contracts(won/lost) bit upfront, which might, change the stock price. So we have to declare all US trading accounts from us and family if any, it will monitored.
Lucky its listed in US, no restriction for indian trades as of now.