Resumen:El año 2017 fue testigo de importantes acontecimientos en relación con el fenómeno de la ideología de ultra derecha en Alemania. Si en enero, el Tribunal Constitucional Federal fallaba en contra de la prohibición del NPD pese a reconocer el carácter antidemocrático de sus objetivos, en julio entraba en vigor una reforma constitucional para excluir de la financiación estatal a formaciones políticas que, siendo contrarias al orden democrático, no sean objeto de prohibición al carecer del potencial necesario para alcanzar sus objetivos. A modo de colofón, septiembre finalizaba con la celebración de elecciones federales y la entrada de la AfD en el Bundestag como tercera fuerza política. A la luz de todo ello, en el presente trabajo se apuesta por el análisis de las principales implicaciones jurídicas derivadas de dichos hechos, ello con el ánimo de ofrecer al lector una visión actualizada sobre el control jurídico aplicable a la ideología de los partidos políticos en Alemania.Summary1. Introduction. 2. The right of every democratic system to its self-defence. 2.1. Theoretical approach. 2.2. Express intangibility clauses and ideological control. 3. The defense of democracy and political parties in the German legal system. 3.1. The German concept of militant democracy. 3.2. Legal regime applicable to anti-democratic political parties. 3.2.1. Constitutional framework. 3.2.2. Basic legislative framework. 4. The German jurisprudential adaptation to the ECHR conventionality control: the NPD case. 4.1. The necessity test according to the ECHR jurisprudence. 4.2. Potentiality as a substitute for the principle of proportionality. 4.3. Anti-democratic but constitutional. 5. Main observations after the recent constitutional reform. 6. Conclusions. Bibliography.Abstract:2017 witnessed important events in relation to the phenomenon of the right-wing ideology in Germany. First, in January, the Federal Constitutional Court ruled against the prohibition of the NPD, despite recognizing the anti-democratic nature of its objectives; then, in July, a constitutional reform came into effect to exclude from the state funding those political formations that, contravening the democratic order, are not prohibited as they lack the necessary potential to achieve their objectives. To conclude, September ended with the holding of federal elections and the entry of the AfD into the Bundestag, as the country’s third largest force. In light of all this, the present work is committed to the analysis of the main legal implications derived from these events, this with the aim to offer the reader an updated view on the legal control applicable to theideology of political parties in Germany.