vyhodb is licensed under two licenses: binary and source code.
vyhodb binary code (vyhodb server itself and everything in vyhodb-0.9.0.zip distribution package) is licensed under vyhodb proprietary license.
The license currently allows you to study vyhodb and use it in evaluation and education purposes. Commercial and free licenses will be available after beta testing period.
vyhodb API source code is licensed under MICROSOFT REFERENCE SOURCE LICENSE. This license allows you to investigate source code and use it in debugging. You are prohibited from changing and/or redistributing vyhodb API source code.