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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> |
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<html> |
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<head> |
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<meta name="Description" content="KLayout layout viewer and editor project page" /> |
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<meta name="Keywords" content="KLayout OASIS GDS2 viewer editor layout semiconductor mask chip design" /> |
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<meta name="abstract" content="KLayout is a free layout viewer and editor for several formats commonly used in the semiconductor industry to transfer layout data" /> |
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<meta name="URL" content="https://www.klayout.de/" /> |
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<meta name="Author" content="Matthias Koefferlein" /> |
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<meta name="viewport" content="width=device-width, initial-scale=1"/> |
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<meta http-equiv="Content-Script-Type" content="text/javascript" /> |
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
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<title>KLayout Layout Viewer And Editor</title> |
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<link rel="alternate" type="application/rss+xml" title="RSS" href="http://www.klayout.de/news.xml"/> |
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<link rel="stylesheet" type="text/css" href="https://www.klayout.de/format.css?v2.0"/> |
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<link rel="shortcut icon" href="https://www.klayout.de/favicon.ico"/> |
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<link rel="stylesheet" type="text/css" href="https://www.klayout.de/fonts.css"/> |
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<script src="https://www.klayout.de/jquery-3.4.1.min.js"></script> |
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<link href="https://www.klayout.de/bootstrap-4.3.1-dist/css/bootstrap.min.css" rel="stylesheet"> |
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<script src="https://www.klayout.de/bootstrap-4.3.1-dist/js/bootstrap.min.js"></script> |
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</head> |
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<body> |
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<div class="klayout-header"> |
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<div class="container mb-5"> |
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<nav class="navbar navbar-dark navbar-expand-lg"> |
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<a class="navbar-brand" href="https://www.klayout.de"><img src="https://www.klayout.de/klayout.png" srcset="https://www.klayout.de/klayout-x2.png 2x" alt="KLayout"></a> |
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<div class="collapse navbar-collapse" id="navbarToggleExternalContent"> |
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<ul class="navbar-nav ml-auto mr-auto"> |
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<li class="nav-item dropdown active mr-4"> |
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<a class="nav-link dropdown-toggle klayout-menu" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false"> |
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About |
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</a> |
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<div class="dropdown-menu" aria-labelledby="navbarDropdown"> |
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<a class="dropdown-item" href="https://www.klayout.de/intro.html">KLayout Project</a> |
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<a class="dropdown-item" href="https://www.klayout.de/doc.html">Documentation</a> |
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<a class="dropdown-item" href="https://www.klayout.de/galleries.html">Galleries</a> |
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<a class="dropdown-item" href="https://www.klayout.de/credits.html">Credits</a> |
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<div class="dropdown-divider"></div> |
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<a class="dropdown-item" href="https://www.klayout.de/contact.html">Contact</a> |
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<a class="dropdown-item" href="https://www.klayout.de/impressum.html">Impressum / Imprint</a> |
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<a class="dropdown-item" href="https://www.klayout.de/privacy_policy.html">Datenschutz / Privacy Policy</a> |
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</div> |
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</li> |
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<li class="nav-item active mr-4"> |
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<a class="nav-link klayout-menu" href="https://www.klayout.de/build.html">Get KLayout</a> |
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</li> |
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<li class="nav-item active mr-4"> |
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<a class="nav-link klayout-menu" href="https://sami.klayout.org">Package Index</a> |
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</li> |
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<li class="nav-item active mr-5"> |
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<a class="nav-link klayout-menu" href="https://www.klayout.de/forum">Forum</a> |
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</li> |
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<li class="nav-item active"> |
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<span class="nav-link klayout-menu"> |
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<a href="https://f-si.org"><img src="https://www.klayout.de/f-si_logo_32h_w.png" border="0" title="Free Silicon Foundation" alt="F-Si"/></a> |
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<a class="ml-4" href="https://github.com/KLayout"><img src="https://www.klayout.de/GitHub-Mark-32px-white.png" border="0" title="KLayout on GitHub" alt="GitHub"/></a> |
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</span> |
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</li> |
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</ul> |
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</div> |
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<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarToggleExternalContent" aria-controls="navbarToggleExternalContent" aria-expanded="false" aria-label="Toggle navigation"> |
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<span class="navbar-toggler-icon"></span> |
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</button> |
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</nav> |
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</div> |
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</div> |
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<div class="container"> |
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<h1>License</h1> |
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<p> |
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KLayout is published under GNU public license GPL version 2 or any later version |
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(<a href="http://www.gnu.org" target="_blank">www.gnu.org</a>) in compliance with the |
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requirements for using the Qt open source licence. If may be copied and |
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distributed freely. |
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</p> |
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<p> |
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<b> |
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This program is distributed in the hope that it will be useful, but |
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WITHOUT ANY WARRANTY; without even the implied warranty of |
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Merchantability or fitness for a particular purpose. Please use it AT |
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YOUR OWN RISK. |
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</b> |
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</p> |
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<p> |
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Any artwork created with KLayout is yours. |
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KLayout can be used freely for any purpose, commerical or private, production or education. |
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</p> |
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<h3>License implications for Ruby and Python scripts</h3> |
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<p> |
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There is some discussion whether the GPL also applies to scripts written in Python or Ruby on |
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KLayout. In other words: whether scripts have to be considered "derived work". In such |
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a case, the GPL implies that these scripts would have to be published under GPL as well. |
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You might consider a KLayout script being "derived" in a sense, that it cannot be run |
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without KLayout's engine. On the other hand, a Python script is still Python, |
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not KLayout, and the functions and classes it uses might as well be taken from a different library. |
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</p> |
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<p> |
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So my interpretation is: such scripts <b>DO NOT</b> count as "derived work". I feel |
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that applying GPL to scripts running on KLayout would seriously limit it's usability |
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in professional applications. |
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So you can develop such scripts and use them freely and without obligations. |
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Such scripts running in KLayout is an exception to KLayout’s GPL license. |
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If you wish to share them, you are free to chose any license, including GPL. If |
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you do not chose GPL, please <b>clearly</b> indicate your license model to |
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avoid confusion with the application's own license. |
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</p> |
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<p> |
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I apply this interpretation as well to the Python packages which wrap KLayout's core |
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algorithms (e.g. "klayout" on PyPI). In other words, you are free to import these packages into your |
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own Python application, regardless of the license you choose. |
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</p> |
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<p> |
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This relaxed interpretation does <b>NOT</b> apply to KLayout's C++ code. Reuse of C++ code |
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is subject to the requirements of the GPL. |
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</p> |
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</div> |
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</body> |
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</html> |
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