1. Fortran code: Copyrighted and Licensed by ACM, see http://www.acm.org/publications/policies/software-copyright-notice 2. R interface and extensions related to Voronoi mosaics (src/voronoi.f, src/left.f): The R interface code has been developed as work based on the ACM licensed code, hence it is also ACM licensed, copyright is by A. Gebhardt . In order to fulfill the ACM copyright and license noted above, it is stated here that this work contains modified ACM material, and to fulfill this, the modified work including the R interface is available free to secondary users, and no charge is associated with such copies. 3. Helper functions taken from SLATEC (src/dsos.f src/func.f): Public domain (according to http://en.wikipedia.org/wiki/Netlib)