@Balaji,
Trial Version is for evaluation purposes for 30 days which comes with ‘Trial Version’ watermark and ‘CanvasJS’ credit link. To use charts without ‘Trial Version’ and ‘CanvasJS’ Credit Link you will need to have a Commercial Version of CanvasJS. Please checkout License Page for more info & contact sales@canvasjs.com for sales related queries.
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Vishwas R
Team CanvasJS