Glossary entry (derived from question below)
Spanish term or phrase:
Por D.F.
English translation:
Authorised by delegation
Spanish term
Spain
Especialista de marketing
Native in: English 
Works in: Spanish to English, Catalan to English
Por D.F.
El GERENTE
Fdo.: (person's name)
(Por D.F. del Rector de fecha ....)
| 5 | Por delegación de firma |
Alboa
|
| 3 | As per/According to (final) provisions |
Virginia Koolhaas
|
Non-PRO (1): AllegroTrans
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Proposed translations
Por delegación de firma
An authorised signatory
Uruguay
Finance, Legal, Intl Org
Native in: Spanish (Variant: Latin American) 
Works in: English to Spanish, Spanish to English, Spanish, and 1 more.
As per/According to (final) provisions
D.F. = Disposición final
"As per Director's/Chancellor's provisions/decision/resolution/decree dated..." (or something of the sort- what applies better in this case)
Please check the references below
http://noticias.juridicas.com/base_datos/Admin/l7-2007.t8.ht...
http://www.la-moncloa.es/Espana/LeyFundamental/disposicion_f...
http://www.unirioja.es/servicios/ose/pdf/curso_formacion_201...
http://www.upv.es/entidades/SRH/conypi/U0533099.pdf
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Note added at 10 hrs (2011-01-19 04:45:25 GMT)
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http://www.uniovi.net/zope/organos_gobierno/unipersonales/vi...
Discussion
Disposición final primera. Habilitación para el desarrollo e interpretación.
Corresponde al Vicerrectorado con competencia en materia de estudiantes el desarrollo, interpretación y resolución de cuantas cuestiones se planteen en la aplicación de esta resolución.
Disposición final segunda. Entrada en vigor.
La presente Resolución entrará en vigor el día siguiente al de su publicación en el "Boletín Oficial del Principado de Asturias" y será de aplicación a partir del curso académico 2010-2011.
En Oviedo, a 11 de marzo de 2010
EL RECTOR
D. Vicente M. Gotor Santamaría
It could be "Por delegación de firma". This is in the glossary as "authorised by delegation". Hope it helps!