Apple has dropped the price of its iTunes Plus songs that have no digital rights management (DRM) software protection and allow owners to move song files freely from one device to another.

The 256kbps DRM-free song files were originally priced at AU$2.19 per song with a lower per-song average price for buying an entire album. iTunes now seems to be offering the same files for AU$1.69 cents per song, the same price it charges for its usual 128kbps DRM versions.

"iTunes Plus has been incredibly popular with our customers, and now we're making it available at an even more affordable price," Tom Neumayr, senior manager for iPods, Apple TV and iTunes, said in a statement.

"We're adding over 2 million tracks from key independent labels, in addition to EMI's digital catalog, and look forward to even more labels and artists making their music available on iTunes Plus."

The change closely follows Amazon.com's launch of its own digital-music store.