Not sure if you want to include things that were used to protect games but:
Code:
|------------|------------------------|-------------------|---------------------|
| Name | Developer | Software Status | Company Status |
|------------|------------------------|-------------------|---------------------|
| SafeDisc | Macrovision | Dead | Operative (TiVo) |
| SecuROM | Sony DADC | Dead | Operative (Sony) |
| StarForce | StarForce Technologies | Operative | Operative |
|------------|------------------------|-------------------|---------------------|