<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /> <meta name="AUTHOR" content="pme@gcc.gnu.org (Phil Edwards)" /> <meta name="KEYWORDS" content="libstdc++, license, licence" /> <meta name="DESCRIPTION" content="Copying restrictions for libstdc++." /> <meta name="GENERATOR" content="vi and eight fingers" /> <title>libstdc++-v3 copying</title> <link rel="StyleSheet" href="../lib3styles.css" type="text/css" /> <link rel="Start" rev="Copyright" href="../documentation.html" type="text/html" title="GNU C++ Standard Library" /> </head> <body> <h1 class="centered"><a name="top">Licenses for the Library</a></h1> <p>There are two licenses affecting GNU libstdc++-v3: one for the code, and one for the documentation. Here we will describe both of them, and try to answer some of the widespread questions. If you have more questions, ask the FSF or the <a href="http://gcc.gnu.org/lists.html">gcc mailing list</a>; the person writing this page is a programmer, not a lawyer. </p> <hr /> <h2>The Code: Runtime GPL</h2> <p>The source code of libstdc++-v3 is distributed under version 2 of the <a href="COPYING">GNU General Public License</a>, with the so-called "runtime exception," as follows (or see any header or implementation file): </p> <pre> As a special exception, you may use this file as part of a free software library without restriction. Specifically, if other files instantiate templates or use macros or inline functions from this file, or you compile this file and link it with other files to produce an executable, this file does not by itself cause the resulting executable to be covered by the GNU General Public License. This exception does not however invalidate any other reasons why the executable file might be covered by the GNU General Public License. </pre> <p>Hopefully that text is self-explanatory. If it isn't, you need to speak to your lawyer, or the Free Software Foundation. </p> <!-- Most of the Q&A's are based on, paraphrased from, and outright stolen from this thread: http://gcc.gnu.org/ml/libstdc++/2000-q2/subjects.html#00050 --> <p><strong>Q: So any program which uses libstdc++ falls under the GPL?</strong> <br />A: <strong>No.</strong> The special exception permits use of the library in proprietary applications. </p> <p><strong>Q: How is that different from the GNU {Lesser,Library} GPL?</strong> <!-- Quoting Jason Merrill from the thread above: --> <br />A: The LGPL requires that users be able to replace the LGPL code with a modified version; this is trivial if the library in question is a C shared library. But there's no way to make that work with C++, where much of the library consists of inline functions and templates, which are expanded inside the code that uses the library. So to allow people to replace the library code, someone using the library would have to distribute their own source, rendering the LGPL equivalent to the GPL. </p> <p><strong>Q: I see. So, what restrictions <em>are</em> there on programs that use the library?</strong> <br />A: None. We encourage such programs to be released as open source, but we won't punish you or sue you if you choose otherwise. </p> <hr /> <h2>The Docs: FDL</h2> <p>The documentation shipped with the library and made available over the web, including the pages generated from source comments, are copyrighted by the Free Software Foundation, and placed under the <a href="COPYING.DOC">GNU Free Documentation License version 1.1</a>. There are no Front-Cover Texts, no Back-Cover Texts, and <!-- as far as I know --> no Invariant Sections. </p> <p>If you plan on making copies of the documentation, please let us know. We can probably offer suggestions. </p> <!-- ####################################################### --> <hr /> <p class="fineprint"><em> Comments and suggestions about this page are welcome, and may be sent to <a href="mailto:libstdc++@gcc.gnu.org">the libstdc++ mailing list</a>. Comments or questions about the licenses themselves are also welcome, and should be directed to the GCC list as descibed above. </em></p> </body> </html>