This grid file is free ; you can redistribute or include in commercial/personal applications.
In the event that you wish to alter the grid file which appears at this ZIP file , for a purpose other than personal, in-house or non-commercial use, you can apply to the Instituto Geográfico Nacional at the following address for formal permission.
Instituto Geográfico Nacional General IbaÅ„ez Ibero 3 28003 Madrid, Spain Centro Nacional de Observaciones Geodésicas
Whilst all effort is made to ensure the accuracy and currency of this grid file, IGN and CNIG does not accept responsibility for any actions arising from the use of this data.