By award for unification of the case law, granted on the 6th of February of 2013, in proceedings number 34/2012, the Court of Final Appeal has declared the invalidity of the registration of a trademark due to the fact of being at stake a widely-consumed product and, therefore, a well-known trademark for the purposes of Article 230 of the Industrial Property Legal Regime. A well-know trademark is not only a basis for objection to registration, but also a reason for challenging the validity of the registration of a trademark.
http://www.court.gov.mo/pdf/TUI/TUI-S-34-2012-VP.pdf (available only in Portuguese)