porque no aparece el copyright

The photo you linked in your post-

Is showing this Metadata (viewed in Bridge)-

Where are you looking for metadata in your exported files?

Try resetting the preferences of Lightroom Classic:  https://helpx.adobe.com/lightroom-classic/help/setting-preferences-lightroom.html

Backup your preferences prior to resetting the preferences: 

https://helpx.adobe.com/lightroom-classic/kb/preference-file-and-other-file-locations.html

If this doesn't help we need more informations about your environment.

Which operating system do you use?

Which version of Lightroom do you use?

Please post the exact version and not only phrases as "recent", "latest" and so on.

Please provide also a copy of your 'System Info'. This can be get from the LrC Help > System Info menu item. There's a copy button in the System Info dialog. Press this button and paste the info into your next forum post.

Do you have set the appropriate options for the metadata in the dialog for Export settings.

Please see here: Controlling Metadata on Export - Lightroom Killer Tips