Remove Vaadin Charts link

Hi,
I’m using vaadin charts for the first time and there is a link at the bottom of the chart “Vaadin Charts” that takes you to a web page, as can be seen here https://vaadin.com/book/vaadin7/-/page/charts.html

How can I remove that?

Thanks
Omar

for version 1.1.1 this work :

Configuration conf = chart.getConfiguration(); // where chart is you chart
conf.getCredits().setEnabled(false);

Thank you.