DRM means on-going expense for the shops

Wal-Mart have backed down on their decision to shutdown their music shop's DRM servers due to protests by consumers.

I guess Wal-Mart will have to continue to run the servers with no revenue stream - they now sell DRM-free MP3s - until very few requests come through to the DRM servers.

I wonder how long that will take and what constitutes very few.

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