Rad je napisan u okviru projekta Pravnog fakulteta Univerziteta u Kragujevcu XXI vek – vek usluga i Uslužnog prava, br. 179012, koji finansira Ministarstvo prosvete, nauke i tehnološkog razvoja Republike Srbije.According to earlier German legal solutions and court practice, letters and groups of letters could not be registered as a trademark except when they were imposed on the market. This restrictive approach is abandoned in European regulations, which also applies on the new German legislation. In other words, the letters and groups of letters are, from the point of view of registration, equal to other marks. However, in relation to the determination of the risk of substitution, trademarks that protect letters show some specificity, si...