Licensing

[BerndDoser]

It is necessary to select a valid license before making the repository public. The package healpy in hipster is using the GPLv2+ license, which restricts us to use a GNU GPL compatible license.

The HITS-supported Hippocratic License 3.0 is not compatible with GNU GPL.

According to the GNU compatibility list I would recommend one of the following licenses in the given order:

• Apache License Version 2.0: free as MIT + blocks patent treachery
• Expat License also known as MIT-licence, very free
• GPLv3: equal to PINK
• LGPLv3: permits use of the library in proprietary programs

Here is a list of all licenses of the pip dependencies collected with pip-licenses --summary:

Count  License                                                          
 1      3-Clause BSD License                                             
 1      Apache 2.0                                                       
 1      Apache License v2.0                                              
 24     Apache Software License                                          
 2      Apache Software License; BSD License                             
 1      Apache-2.0                                                       
 1      BSD                                                              
 1      BSD 3-Clause                                                     
 49     BSD License                                                      
 1      BSD License; GNU Library or Lesser General Public License (LGPL) 
 1      GNU General Public License v2 or later (GPLv2+)                  
 1      Historical Permission Notice and Disclaimer (HPND)               
 2      ISC License (ISCL)                                               
 43     MIT License                                                      
 1      MIT License; Mozilla Public License 2.0 (MPL 2.0)                
 1      Mozilla Public License 2.0 (MPL 2.0)                             
 15     Other/Proprietary License                                        
 2      Python Software Foundation License                               
 1      The Unlicense (Unlicense)                                        
 1      UNKNOWN

[BerndDoser]

• The healpy dependency is not critical and will be removed anyway because of performance issues.
• @kai-polsterer, @andife and @BerndDoser approved the Apache-2 license.