The project was designed to present and use by the scientific community, academics, teachers and students, history researchers, enthusiasts, but also entrepreneurs active in the cultural and creative digital versions of library copies which constitute valuable and unique Polish cultural heritage. The digitised and accessible cultural resources will come from the collection of the two largest libraries in Poland: The National Library (BN) and the Jagiellonian Library (BJ), whose collections due to their exceptional value and importance are classified as the National Library Resources on the basis of laws and implementing acts. For digitisation, documents are selected, some of which are made available under specific conditions for reasons of safety and protection of harvests. These include cymeliia, pre-1801 prints, manuscripts (including musical manuscripts and handwritten maps), graphics, drawings, photographs, maps before 1946, archival copies of ephemeral prints prior to 1946 and other collections requiring special protection for conservation reasons. A total of 652 thousand objects from BN resources and 348.7 thousand BJ facilities will be digitised. The selected objects will be subjected to a technological process, the effect of which will be made available on the portal Polona National Library, whose repository system and graphical interface will be expanded. The integration of the systems for sharing both libraries will also be carried out. It is also planned to modernise and improve the functionality of the Jagiellonian Digital Library Service System (JBC). Objects that will come from BJ resources will be presented in parallel on the JBC portal, which will increase the interest in the objects made available. JBC readers will also be informed about the collections placed on the BN portal, which will also potentially increase knowledge about the Polona portal and ultimately increase the number of users.