RealNetworks is set to kick off a high-profile digital music marketing campaign, highlighting the new iPod-compatible technology that has swung the company into conflict with Apple Computer. For a limited time, RealNetworks will offer song downloads from its music store for 49 cents, along with half-price albums. The campaign is the second wave of publicity around the company's Harmony technology, which effectively recreated a version of Apple's proprietary copy-protection technology without Apple's permission. That has allowed RealNetworks to be the first non-Apple store that can distribute songs directly compatible with the iPod music player, despite strong protests from Apple itself.