Hi Minal
My suggestion to you is ,please include the clause mentioned below in your Appointment Letter/ Confirmation Letter /Company Manual/ Notice Board ,if you have not done it already
"Except to the extent to which the employer may permit, you shall keep secret the knowledge, information, trade/business data and skills and the like, which you may acquire during your employment tenure with us and such obligation shall continue even if you leave the employers service, during the intervening period, for any reason whatsoever.The management shall take strict disciplinary/legal action if you deviate from this policy"
You should also make sure that there is proper documentation that all employees have read and understood the clause
I hope this makes sense to you