2) Evidence Act here you need to prove what you say in court of law as per the provision of Evidence Act.
3) Contract Act If you have done something of commercial value and if it was not your intention to do it free (gratuitously), then you are entitled to be compensated for what you may have done.
4) Law of Tort If you had shared something in confidence to someone and if there was an implied duty on him of not to leak and not to take advantage of what you told him in confidence, you may be entitled to claim damages if you can prove breach of duty.
The Basic Laws here are
a) No one has right to put you in any kind of damage unless authorized by law to do so.
b) Courts are usually inclined to remove injustice unless they are prevented by lack of evidence or by express bar of some provision of law.