Barcepundit has the story here.
My attempted translation of the body of the advertisement (from my HS and College Spanish, IANAE):
You can do a lot in one day.
Imagine what can be done in three months.
Now, if you subscribe to EL PAIS.es before October 8th, we will give you three months free.
In EL PAIS.es, you will encounter up-to-the-minute current events, analysis from all perspectives, news from the last hour, more than 1.3 million published articles back to 1976, exclusive multimedia animations and some of the largest companies in our country.
Subscribe now to EL PAIS.es and enjoy three months of news free.
UPDATE: Just thought I should mention this is via Lileks.