Software Protection

ActiveLock
A control that can be used to protect programs against piracy. Supports locking program features that can only be unlocked via registration. By Nelson Ferraz. [Control, Open source]
http://www.activelock.com/

AppExpire
An OCX component that allows shareware authors to add registration code functionality to their software. By Encom Incorporated. [Control, Commercial]
http://www.encomsw.com/appexpireinfo.html

Crypto++ SDK
A software copy protection and licensing package. By Sampson Multimedia. [Control, Commercial]
http://www.sampson-multimedia.com/

KeyboardControl SDK
Allows custom Win32 applications to expand control over the Windows environment by adding the ability to filter out any keystroke or combination keystroke including PrintScreen, Alt+Tab, Alt+F4, Ctrl+Tab, Ctrl+Alt+Del, Alt+Esc, and Ctrl+F4, on all versions of Windows including Windows NT/2000 and XP. Supports any Win32 compliant IDE. [Commponent, Commercial]
http://www.meliorasoft.com/kits/

Protection PLUS and SoftwareKey SOLO
Concept Software offers Protection PLUS, a software licensing toolkit that provides copy and network protection tools for software piracy and demo creation/trialware, as well as SoftwareKey SOLO e-commerce technology. By Concept Software.
http://www.softwarekey.com/swk_products/solo/instant/

ShareBlock
A multiple user licencing management ActiveX control. By CBitSoft.
http://www.cbitsoft.com/item.asp?SoftwareID=10

Sheriff
ActiveX (OCX) control. The Sheriff Software Development Kit provides software developers with secure copy protection. Free evaluation copy available.
http://www.sheriff-software.com

SoftwareKey Licensing System
Concept Software offers ActiveX based software licensing toolkits that provide copy and network protection tools for software piracy, demo creation, trialware, and e-commerce.
http://www.softwarekey.com/