[Twisted-Python] Twisted & Qt
twisted-python at 2xlp.com
Tue Sep 26 19:42:57 EDT 2006
if this helps at all:
Both copied below.
If a library is released under the GPL (not the LGPL), does that mean
that any program which uses it has to be under the GPL?
Yes, because the program as it is actually run includes the library.
If a programming language interpreter is released under the GPL, does
that mean programs written to be interpreted by it must be under GPL-
When the interpreter just interprets a language, the answer is no.
The interpreted program, to the interpreter, is just data; a free
software license like the GPL, based on copyright law, cannot limit
what data you use the interpreter on. You can run it on any data
(interpreted program), any way you like, and there are no
requirements about licensing that data to anyone.
However, when the interpreter is extended to provide "bindings" to
other facilities (often, but not necessarily, libraries), the
interpreted program is effectively linked to the facilities it uses
through these bindings. So if these facilities are released under the
GPL, the interpreted program that uses them must be released in a GPL-
compatible way. The JNI or Java Native Interface is an example of
such a binding mechanism; libraries that are accessed in this way are
linked dynamically with the Java programs that call them. These
libraries are also linked with the interpreter. If the interpreter is
linked statically with these libraries, or if it is designed to link
dynamically with these specific libraries, then it too needs to be
released in a GPL-compatible way.
Another similar and very common case is to provide libraries with the
interpreter which are themselves interpreted. For instance, Perl
comes with many Perl modules, and a Java implementation comes with
many Java classes. These libraries and the programs that call them
are always dynamically linked together.
A consequence is that if you choose to use GPL'd Perl modules or Java
classes in your program, you must release the program in a GPL-
compatible way, regardless of the license used in the Perl or Java
interpreter that the combined Perl or Java program will run on.
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