Apple and other US companies must officially state to the Securities and Exchange Commission (SEC) that their internal systems are capable of tracking down and eliminating fraud.

A deadline of August 29 has been issued by which to make the statement to the SEC. Companies have been advised that they may need to alter their accounting procedures accordingly.

The measures taken to infiltrate fraudulent transactions do not need to be disclosed, but companies may volunteer the information if they wish to do so. Last week, Apple's chief executive and financial officers Steve Jobs and Fred Anderson submitted signed statements under oath declaring the accuracy of Apple's financial statements to the SEC.

The statements were signed and filed with the SEC on August 8. The SEC is taking new measures to ensure the accuracy of firm's financial statements in the wake of financial scandals, such as Enron and WorldCom.