Ontology defining 39 Open Source Software Licenses with their license type (Copyleft. Permissive or Public Domain), their conditions (hasCondition), limitations (hasLimitation), permissions (hasPermission) and recommended use (isRecommendedFor).
In addition, there are compatibility relations defined between license types (isBackwardCompatibleWith, isForwardCompatibleWith) and software licenses (isExplicitelyCompatibleWith, isNotCompatibleWith) to express exceptions of the type based compatibility.