iTunes music: The cost of removing Apple’s copy protection - Apple 2.0

"Leave it to Apple (AAPL) to turn the lifting of restrictions into a profit center. If users convert every one of the 9 billion songs purchased from the iTunes Store over the past six years, a rich new revenue stream will flow toward Cupertino. Techcrunch’s Erick Schonfeld calls it Apple’s “$1.8 billion music tax.”"