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 > Kartpro

example.com/admin/appearance/settings/kartpro

On this page, you can show / hide copyright text.

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Custom Copyright Text

Enable custom copyright

Enable custom copyright text and save configuration.

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Create content block

Navigate to: Administration > Content > Block and create a new block for your custom copyright text.

example.com/admin/content/block

Block Placement

Place this block content in Footer Copyright region.

example.com/admin/structure/block