According to Section 52 of the Czech Act No. 104/2013 Coll. on International Judicial Cooperation in Criminal Matters Service of Documents
(1) Addressee in the Czech Republic may be served documents drawn up in the language that is assumed, with regard to all circumstances, to be understood by the addressee, or documents provided by a translation into this language.
(2) If the document is not drawn up in language according to conditions referred to in Sub-section (1), or provided with a translation into this language, the foreign authority will be requested to provide translation of the document and at the same time will be advised that otherwise the document without a translation will be served to the addressee only under the conditions of sentence three. If an international treaty stipulates that the foreign authority is not obliged to provide translation of documents, it will be provided by the judicial authority competent for executing the request of the foreign authority for legal assistance. Translation of documents is not necessary, if the addressee, after being advised on the option to refuse personal service of documents in a language he does not understand, which are not provided with a translation into a language he understands, declares that he is willing to accept the documents.
(3) Documents will be served to the addressee pursuant to the provisions of the Code of Criminal Procedure on process serving. On the basis of an explicit request on the foreign authority the documents may be served personally or through a judicial authority, which will draw up a protocol of the service. The protocol will reflect, in addition to requirements referred to in Section 55 (1) of the Code of Criminal Procedure also the exact specification of the served documents.
(4) The foreign authority may serve documents to an addressee in the Czech Republic directly through a postal services provider only if it is allowed by an international treaty or with a previous consent of the Minister of Justice according to Section 4 (4).
(5) If the served documents contain a threat of enforcement, such threat is ineffective in the territory of the Czech Republic.