Evaluation version of Aspose.Cells for Reporting Services (without a license specified) provides product functionality to some extent not complete though. One limitation is that it always injects an extra worksheet with evaluation watermark on open / save any spreadsheet document.
Figure: Demo Spreadsheet created by Aspose.Cells component
It will inject an extra evaluation watermark worksheet to the workbook.
Figure: Evaluation Warning – An Extra Worksheet
If you want to test Aspose.Cells for Reporting Services without evaluation version limitations, you may request a 30-day temporary license.