The preferred license for OpenAmiga software is either to use MPL(Mozilla Public License) or to simply use no license at all (Public Domain with no commercial restrictions). MPL requires that individual source files remain Open Source, but does not require that files linked to it must also be MPL. This means that Hyperion must provide OpenAmiga with changes they do to the individual source files that OpenAmiga has provided but not for files that Hyperion has developed themselves or been provided by some other means. MPL is also the license that was suggested by Hyperion for the OpenAmiga project.
Licenses such as GPL and LPGL should be avoided as much as possible.
Read about MPL here
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