Might be here:
https://www.nic.es/noticias/notas/conflicto_admin.html
Might be anywhere on that site, but that's fairly common (Now registries enforcing those rules is another matter entirely.).
-Allan
(Maybe a bit here, also:
https://www.nic.es/faqs/normas_usos.html )
(Poorly Translated:
A dominion "es" can at the request of be cancelled or by the public organization enterprise Red.es or part, in the following cases:
1. When the dominion names are asked for by physical or legal people and organizations without legal personality that interests do not have or do not maintain bonds with Spain.
2. When the beneficiaries of the compound names of dominion exclusively by last names or a combination of own names and last names do not have direct relation with such.
3. When in the Registry false or incorrect data consist.
4. When the rules and specificationses established by the Authority of Allocation for the suitable operation of the system of names of dominion under "es" are failed to fulfill.
5. When the assigned names of dominion fail to fulfill the norms of syntaxes regulated in the section First of the Disposition Eleventh of Order ITC/1542/2005, of 19 of May and other anticipated conditions of allocation to the effect in the National Plan. If You it thinks that a dominion "es" is in some of the cases previously reviewed, it will be able to ask for the cancellation of the same one, sending a document to the direction of electronic mail
[email protected], according to the model established, in which it will have to be identified properly and to credit the breach of the conditions of allocation in the predicted terms previously, according to the Instruction by which the procedure of cancellation of dominions settles down "es".