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<p>and require the work and its derivatives to be provided in a form that allows further modifications to be made. In <a href="page.php?w=Computer_software">software</a>, this means requiring that the <a href="page.php?w=source_code">source code</a> of the derived work be made available together with the software itself.</p>

<p><big> Economic incentive </big></p>
<p>The economic incentives to work on copyleft works can vary. Copyright law was originally intended to promote progress by encouraging economic benefits to authors. When choosing to copyleft their</p><p>
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