MP3 player manufacturers, including Apple Computer, Dell and Hewlett-Packard, are challenging a [URL=http://www.techspot.com/vb/showthread.php?threadid=9575&highlight=canada]recent regulatory ruling[/URL] in Canada that would impose an extra fee of as much as $25 on iPod-like digital music players.

A group of retailers, including Wal-Mart Stores and Best Buy, also is appealing the decision, which will be heard by a federal court.

Read more: [URL=http://news.com.com/2100-1027_3-5140374.html?tag=st_lh]CNet News[/URL].