Sony has sued the company it got to write the root kit that was used in an attempt to protect its CDs (and got the company into all sorts of trouble) for a whopping $12 million.

The summons accuses The Amergence Group Inc. of 'negligence, unfair business practices and breaching the terms of its license agreement by delivering software that "did not perform as warranted'.

The settlement that Sony came to with owners of the CDs cost a total of $5.75 million. Should the judge find against them in this case the total cost to their business is only going to go up.

Unsurprisingly, The Amergence Group said they would fight the allegations.

This could get interesting.