It seems that SunnComm have decided not to sue Alex Haderman after all.

"SunnComm president and CEO Peter Jacobs said he changed his mind.

Jacobs said in an interview late last night that a successful lawsuit would do
little to reverse the damage done by the paper Halderman published Monday
about his research, and any suit would likely hurt the research community by
making computer scientists think twice about researching copy-protection
technology.

"I don't want to be the guy that creates any kind of chilling effect on
research," Jacobs said."