Business secret is protected by Decree-Law 143/2008.  Also, according to the Competition Law, in gathering evidence, the Authority shall safeguard the legitimate interests of undertakings by not revealing their business secrets. Note the EU Directive 2016/943 on harmonisation the protection of undisclosed know-how and business information (trade secrets) came into force in July 2016. Transposition must be completed before June 2018. See: http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv:OJ.L_.2016.157.01.0001.01.ENG&toc=OJ:L:2016:157:TOC. The DIrective was transposed in Portuguese legislation by the Decree Law 110/2018. Provisions on trade secrets entered into force in January 2019.