You're only guilty if you actually help commit the crime.

Under this section, simply hiding knowledge of a criminal plan or lying about it — if done knowingly or intentionally to help — can itself be an offence, even without direct participation.

Staying silent is always safe legally.

If you have a legal duty to disclose information and you unlawfully stay silent (an 'illegal omission') knowing it helps a crime happen, that silence can be punishable.

Indian Penal Code, 1860

Section 120

repealed

Concealing design to commit offence punishable with imprisonment

Whoever, intending to facilitate or knowing it to be likely that he will thereby facilitate the commission of an offence punishable with imprisonment, voluntarily conceals, by any act or illegal omission, the existence of a design to commit such offence, or makes any representation which he knows to be false respecting such design:§

Why this exists

The Indian Penal Code's drafters wanted to discourage people from becoming silent partners in crime by hiding plans they knew about. Sections 118 to 120 form a graded scheme: Section 118 deals with concealing plans for the most serious offences (death or life imprisonment), while Section 120 covers concealment of plans for offences punishable with any term of imprisonment. The idea is that knowingly shielding a criminal plan — through silence, an illegal omission, or false statements — makes a person complicit even without directly committing the planned offence.

Common misconceptions

Myth: You're only guilty if you actually help commit the crime.
Fact: Under this section, simply hiding knowledge of a criminal plan or lying about it — if done knowingly or intentionally to help — can itself be an offence, even without direct participation.
Myth: Staying silent is always safe legally.
Fact: If you have a legal duty to disclose information and you unlawfully stay silent (an 'illegal omission') knowing it helps a crime happen, that silence can be punishable.