As in most countries, Indonesia inposes blanket bans on importing narcotics, pornography and firearms and ammunition.
You also may run into quarantine issues leading to confiscation if carrying foodstuffs, plants and fresh fruit. However, these regulations are nowhere near as severe as in other jurisdictions like Australia.
Technically films, video tapes, laser discs, records and computer software must be screened by the censor board. We are yet to meet anyone who has been called upon to comply – however, best to not carry anything contentious or nasty, just in case.