License information regarding MADlib and included third-party libraries can be found inside the license directory. ASF licensing guidance for MADlib pertaining to its pre-Apache history as an open source project with BSD licensing is described here.
MAD Skills : New Analysis Practices for Big Data (VLDB 2009)
Hybrid In-Database Inference for Declarative Information Extraction (SIGMOD 2011)
Towards a Unified Architecture for In-Database Analytics (SIGMOD 2012)
The MADlib Analytics Library or MAD Skills, the SQL (VLDB 2012)
PivotalR - lets the user run the functions of the open-source big-data machine learning package MADlib directly from R.