The plan to furnish students in Cobb County in Georgia, USA with iBooks has been delayed, again.

This time the delay is due to a clause in the contract that means the school will be liable for 50 per cent of the costs should they need to replace faulty machines, writes The Atlanta Journal-Constitution, which claims to have obtained a draft of the contract.

The school board voted unanimously not to accept any cap on liability in the contract on March 24, with members saying it was the board's duty as a public entity to protect taxpayers.

Under the programme Cobb's school board is expected to seed 63,000 Apple iBook laptops to students in grades 6-12 and all teachers. Student laptops that are damaged or lost would be replaced under a separate insurance.

Board chairwoman Kathie Johnstone told The Atlanta Journal-Constitution: "Both sides are talking. We hope to come to an agreement within the next few days. We'd like to vote on the proposal on Wednesday."