É um software gratuito, sujeito às restrições do software de terceiros do qual o Panoply depende. De link (você terá que clicar no botão "Clique para ver mais" em "Usar restrições" para ver a licença):
Scope of License. Subject to all the terms and conditions of this license and of the individual licenses of any third-party libraries, NASA Goddard Institute for Space Studies grants the user royalty-free, nonexclusive, nontransferable, and worldwide rights to reproduce, modify, reverse engineer, and distribute the Panoply software package, herein referred to as the Product.
Conditions and Limitations of Use. Neither the U.S. Government, nor any agency or employee thereof, makes any warranties, expressed or implied, with respect to the Product provided under this License, including but not limited to the implied warranties or merchantability and fitness for any particular purpose.
Liability. In no event shall the U.S. Government, nor any agency or employee thereof, be liable for any direct, indirect, or consequential damages flowing from the use of the Product provided under this License.
Non-Assignment. Neither this License nor any rights granted hereunder are transferable or assignable without the explicit prior written consent of NASA Goddard Institute for Space Studies.
Names and Logos. User shall not substitute its name or logo in identification of the Product.
Export of technology. User shall comply with all U.S. laws and regulations restricting the export of the Product to other countries.