RealNetworks Chairman and CEO Rob Glaser has urged Apple's CEO Steve Jobs to partner its digital music businesses against rival Microsoft, according to a report published in The New York Times online edition.

In an email sent April 9, Glaser offered to create a "tactical alliance" with Jobs and Apple, the report said, citing the message that was obtained by The New York Times "from a person close to Apple."

Should Apple and RealNetworks be unable to reach an accord, RealNetworks may turn to Microsoft to pursue "very interesting opportunities," the report quoted Glaser as writing.

RealNetworks representative Frank Keeling, vice president of Europe, Middle East and Africa (EMEA), said he was unable to comment at this time and representatives from Apple could not immediately be reached for comment. A spokesman for Microsoft in Europe said he was unaware of the report.

An alliance between RealNetworks and Microsoft would be an about-face in the relationship between the two companies. RealNetworks has long lobbied against Microsoft's market dominance and currently has a private lawsuit lodged against Microsoft in the US accusing the company of using its monopoly powers to control the digital media market with its Windows Media Player to the detriment of Real's competing player.

But given that Apple is currently the digital music market leader with its iTunes online music store, Glaser would like see RealNetworks licence Apple's Fairplay digital rights management system in exchange for making Apple's popular iPod music player the primary device for the RealNetworks store and for the RealPlayer software, according to the report.

Though RealNetworks' encrypted music services, Rhapsody and the Real music store, both support the digital music technology standard favoured by Apple -- AAC -- the RealNetworks services cannot currently be played over an iPod. That limitation may force RealNetworks to switch to Microsoft's competing WMA format, the report quoted Glaser as writing.

However, he was quoted as writing, "instinctively I don't want to do it because I think it leads to all kinds of complexities in terms of giving Microsoft too much long-term market momentum."

Glaser has not received a response from Apple's Jobs and it is unlikely Apple would agree to Glaser's proposals, the report said.