Wikipedia
Locklizard
LockLizard Limited is a British software company that specializes in digital rights management security for PDF documents, USB flash drives and eBooks. It was founded in 2004 by Trevor Mathews to provide Document Digital Rights Management (DRM) software that uses encoding and encryption to protect against unauthorized copying, sharing, unlimited printing or printing on virtual devices, and screen grabbing on PCs or mobile devices. Locklizard most notable customers are NASA, Microsoft, HP, SAP, Yamaha, BBC, Symantec, AMD, McGraw-Hill Education.