From the publisher's webpage:
The Prison Planet
"Welcome to Darkmoon Imperial Prison. I am Warden Kaede Malone, and you are very lucky. Instead of a filthy, lice-infested prison mine, you've come to a clean, state-of-the-art correctional facility.
"Darkmoon Prison is operated under Ministry of Justice charter by Schunamann und Sohn AG. You will work hard to repay your debt to society for the crimes you committed, and your debt to SuSAG for providing the necessities of life here. If you demonstrate contrition and participate in recommended programs, you may qualify for change in your status and stay at a minimum-security facility.
I see mention that this is a SuSAG operation has caused a stir. Don't be afraid! SuSAG pharmaceuticals are all extensively tested on animals before any human trials are run."
The Darkmoon system has been many things -- a base for the Imperial Navy, a System Defense Boat and Space-Submarine Warfare School, the last stop of a fringe group of cultists seeking to escape the downfall of civilization . . . but when the Navy left, the system became a backwater, and economic ruin set in. To the rescue came the megacorporation Schunamann und Sohn AG, which turned the facility into a maximum-security enterprise.
On a gas-giant moon under miles of ice and water, this "escape-proof" prison is the final stop for 3,000 of Imperium's worst scum, from corsairs to Ine Givar terrorists. But Darkmoon is no ordinary prison world . . . a prisoner who steps out of line may find that he's been reclassified "lab rat."