By default theme will show a copyright text in footer. Format of this text is:
© YEAR SITE-NAME, All rights reserved.
How to Show / Hide footer copyright text
Footer copyright can be managed from theme settings page.
Navigate to: Administration > Appearance > Appearance settings > Nava
example.com/admin/appearance/settings/nava
On this page, you can show / hide copyright text.
Custom Copyright Text
This feature is available in Nava Pro theme.