CMI Python Stark effect calculation extensions are provided as is. They are licensed under the GPL v3, see COPYING for details, with the following additional requirements:
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Its use for scientific work must be acknowledged by the appropriate reference in any resulting work, e.g., scientific publication. The appropriate reference is:
Yuan-Pin Chang, Frank Filsinger, Boris Sartakov, and Jochen Küpper: CMIstark: Python package for the Stark-effect calculation and symmetry classification of linear, symmetric, and asymmetric top wavefunctions in dc electric fields, Computer Physics Communications 185, 339–349 (2014), DOI: 10.1016/j.cpc.2013.09.001; preprint available at arXiv:1308.4076 [physics]
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Any corrections and enhancements must be contributed back to the development of the package within an appropriate time, i.e., no later than the publication of its first use.