Also see "When Is Downloading Music on the Internet Illegal?" in the "Did You Know" section of Webopedia.

DRM Watch
Analysis of digital rights management technology.

iTunes goes DRM-free with EMI
Apple's iTunes Store began selling DRM-free songs from EMI. DRM (digital rights management) software prevents owners from copying or freely using a digital file across multiple devices.

Weboopedia's "Did You Know... Digital Audio Formats"
Many different digital audio formats and different software are used to create, store and manipulate these files, the good news for consumers is that there is also a wide range of devices and products available that support multiple formats.

Webopedia's "Did You Know...?" Section
Use this Webopedia knowledge section for an in-depth overview of specific technologies and occurrences in the areas of Computer Science, The Internet, and Computer Hardware and Software.