How to remove or change Magento copyright section from admin login
Solution
To remove it:
app/code/Vendor/Module/view/adminhtml/layout/admin_login.xml
<page xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" layout="admin-login" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_configuration.xsd">
<body>
<referenceBlock name="copyright" remove="true"/>
</body>
</page>
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