On 10/28/2021 2:30 AM, Charlie Boilley wrote:
how can be 100% sure
For some kinds of intellectual property questions, such certainty may not be available.
If the question affects a very large and expensive production, consulting with a qualified attorney may be in order.
For my own personal-use things, I've observed the Free Software Foundation and the LilyPond community long enough to have a fair idea of what they would and would not tolerate for usages of their products.
-- Karlin High Missouri, USA
