Digital downloadable music is taking off rapidly. At present only three per cent of all on-line sales consist of digitally downloadable products. With the introduction of secure music platforms and the multiplicity of portable digital audio players, the figure is expected to rise to 22 per cent by 2004. However, digital music might also cause problems. It can be duplicated and pirated easily. The International Federation of the Phonographic Industry claimed that illegal music duplication cost the industry billions of dollars annually worldwide. It has been suggested that secure music technology should be introduced to guarantee artists' copyrights, ensuring record companies, artists and publishers get duly paid.