According to the Office the MAC POLLO mark was not strongly similar to any of the McDonald’s marks to the extent that could lead to consumer confusion. Although all the compared marks contained the prefixes MAC- or MC-, those prefixes were used in various Scottish surnames, for which reason they were very well known by the consuming public. The POLLO element of the applicant's mark, together with the various elements of the McDonald's marks that were not found in the applicant's mark, removed the likelihood of confusion.
Source: Luz Helena Adarve (Cárdenas & Cárdenas Abogados, Bogotá), writing in the INTA Bulletin, Vol. 64, No. 1, 1 January 2009