While the global trade value of the emerging digital music market roughly doubled to about $2 billion in 2006, the recorded music industry has reiterated there must be "no room for complacency" in its mission to quash online music piracy.

Digital music now generates about 10% of worldwide recorded music sales, according to the International Federation of the Phonographic Industry (IFPI), a figure which it expects to rise above 25% by 2010.

The IFPI this morning (Jan. 17) published its findings in the 2007 "Digital Music Report," and revealed its contents during a gathering for media and industry executives at its London secretariat .

Of the overall digital sum accumulated in 2006, mobile music was responsible for approximately half of revenue in 2006. "I would expect mobile to surge ahead," commented Barney Wragg, head of digital for EMI worldwide, at the breakfast briefing.

Among the key developments outlined in the annual document, the number of titles available across legitimate digital music sources last year was shown to have doubled to four million, while digital formats have also given a shot in the arm to the classical music genre and helped revive physically deleted works.

Speaking at the gathering, IFPI chairman/CEO John Kennedy admitted that the digital market "remains a challenge," and said co-operation with Internet service providers was increasingly vital in the fight against online piracy. "If the ISPs would step up, it would have a huge impact," he said.

One of the industry's chief goals for 2007, added Kennedy, was to make inroads toward achieving the "holy grail" - a state in which digital music sales compensate for the decline in CD sales.

Kennedy also revealed the IFPI would take further legal actions in 2007, having led successful litigation against individual uploaders, and companies such as Kazaa in Australia, Bearshare in the United States, ZoekMP3 in Netherlands and Kuro in Taiwan, in recent months.

About 10,000 international legal actions were launched by labels against large-scale peer-to-peer uploaders in 2006, according to IFPI. "We always prefer co-operation to litigation," Kennedy said. "But sometimes, you need to litigate to get co-operation."