Re: Is the xdebug's non-free license necessary?
An idea parallel to "fair use" is present in the Berne Convention,
under the name "fair practice":
Article 10 (1) It shall be permissible to make quotations from a work
which has already been lawfully made available to the public, provided
that their making is compatible with fair practice, and their extent
does not exceed that justified by the purpose, including quotations
from newspaper articles and periodicals in the form of press
summaries.
The details of code and interpretation do of course vary from country
to country.
Cheers,
- Michael
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