The International Crisis Group says the Islamist organisation appears to be trying to rebuild and spread its message via the printed word.

The claim comes after a series of successful operations against the militants by security forces.

Jemaah Islamiah has been blamed for a string of attacks in Indonesia.

The most notorious is the Bali night club bombing of 2002 in which more than 200 people died.

Three men awaiting execution for their part in the attack are thought to be leading members of the Islamist organisation.

The International Crisis Group (ICG) claims the network of printers, translators, designers, marketers, and distributing agents is one of many webs binding Jemaah Islamiah together.

The ICG believes the material being published reflects a debate within the militant group over tactics.

While some of the books are texts downloaded from websites linked to al-Qaeda, others are articles by well-known Middle Eastern radicals who have rejected terrorist methods.

"These publishing houses should not be closed down or their books banned," said the ICG's John Virgoe.

"But by enforcing existing laws on labour, trade, publishing and taxation, the government could exert closer scrutiny than it is doing now and gain valuable information at the same time."