From the website:
VOAG stands for “Vocabulary Of Attribution and Governance”. The ontology is intended to specify licensing, attribution, provenance and governance of an ontology. VOAG captures many common license types and their restrictions. Where a license requires attribution, VOAG provides resources that allow the attribution should be made. Provenance is defined in terms of source and pedigree. A miminal model of governance is provided based on how issues, releases and changes are managed. VOAG does not import, but makes uses of some concepts from VOID (http://vocab.deri.ie/void), notably void:Dataset.