OpenData.sk as an initiative to promote the dissemination of data emerging in the public sector and improving its quality and availability. Conceptual, methodological and technological challenges of technical solutions. Different approaches and strategies for data harvesting, the pursuit of sustainability - aggregation vs. federated approach. Ways of improving the quality and quantity of public data. Contextualization and aggregation of information and internal coherence. Crowdsourcing and collaborative approach to public data services. Tools and potential applications on quality and up-to-date data.

Concepts of virtual libraries and their integration within the Europeana project. Fragility of digital data as a challenge for CASPAR project. Custodea as open source initiative for efficient solutions in the cultural sector. Europeana, CASPAR and Custodea as a follow-related community projects. Project Custodea will be presented - www.custodea.sk: Custodea as logical and technological support for Europeana and Europeana Local based on principles set out in the CASPAR project. Solutions Custodea for "memory" institutions - galleries, museums, libraries, etc. Custodea solutions covering digital data and metadata harvesting, transformation and conversion, retrieval, storage, presentation and content delivery - for Europeana as an example.