I donno If you have the rights to remove the copyright. Anyway here is the fix
you can remove it in this File: app\design\frontend\default\jm_themetemplate\page \html\footer.phtml
You need to purchase the Copyright Removal add-on ($40) first to have permission to remove the footer copyright. Simply log-into JoomlArt.com, go to member area, then Copyright Removal to get this add-on.
Once you obtain the permission, you can do as Chavan advised to remove the copyright.
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