The owner of an ".es" domain or, when appropriate, a fully authorised representative, must send notification of acceptance of the transfer of the right to use the ".es" domain, along with a photocopy of their identification document, using the following document.
Notification from the previous owner
https://www.nic.es/media/2007-12/1197027684520.pdf
The recipient of the ".es" domain must send Red.es the form stating compliance with the provisions of the Domain Plan, acceptance of the transfer conditions and the request to modify the registry information for the domain in question.
If the domain is to be managed directly through Red.es, send the following document: Acceptance of conditions by the new owner
https://www.nic.es/media/2008-06/1212491347292.pdf
If the domain is to be managed through a Registrar, send the following document: Acceptance of conditions by the new owner through a Registrar
https://www.nic.es/media/2008-06/1212491544925.pdf
Once all the information indicated above has been received and verified, Red.es will send both the recipient or, when applicable, the Registrar, and the owner confirmation, by electronic means, that the transfer has been completed.
All documents related to the ".es" Domain Transfer Procedure must be e-mailed to [transmision @ nic.es], indicating the domain name on the subject line of the e-mail.
If you are transferring several domain names, indicate the first domain name and the number of domain names affected on the subject line of the e-mail.
The applications for this procedure must be submitted with the documents in Spanish.
This pdfs in English are only for information purposes.
Notification from the previous owner
Acceptance of conditions by the new owner
If the domain is to be managed through a Registrar, send the following document: Acceptance of conditions by the new owner through a Registrar