='question'>What's exactly the license of FPDF? Are there any usage restrictions?</span></p>
FPDF is released under a permissive license: there is no usage restriction. You may embed it
freely in your application (commercial or not), with or without modifications.
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<li id='q2'>
<p><b>2.</b> <span class='question'>I get the following error when I try to generate a PDF: Some data has already been output, can't send PDF file</span></p>
You must send nothing to the browser except the PDF itself: no HTML, 