@ctivate - Activation Solutions is a software license management system solution to protect your software product from illegal copying or distribution.
LicenseWatch - License Management
Keygen - A dead-simple software licensing API built for developers
Vector Vizor Software - Vizor Software manages the entire software estate, including on-premise PC software licenses, mobile app purchases and cloud service subscriptions.
Black Duck Hub - Black Duck Hub open source management helps security and development teams identify and eliminate open source security risks.
WebCops - With more than 30 years of experience in copy-protection and encryption. Link Data is making protection for CD, DVD, USB and web on Windows, Mac and Linux.