OSA Archivum, also known as the Vera and Donald Blinken Open Society Archives, is a renowned brand that serves as both an important repository of historical collections and a laboratory for innovative archival experiments. Established in 1995 and opened to the public in 1996, OSA Archivum is a major international repository for Cold War materials, Radio Free Europe documents, and samizdat holdings. With over 7,500 linear meters of records, 11,000 hours of audiovisual recordings, and 12 terabytes of digital data, OSA Archivum is one of the largest archives in the world.

It is particularly focused on preserving collections related to human rights movements and grave human rights violations. In addition to providing open-access facilities to researchers and the general public free of charge, OSA Archivum offers a range of products and services. Their digital repository contains over 117,200 items on the history of the former Eastern Bloc from 1951 to 1994.

They curate and organize numerous free public programs, including exhibitions, academic conferences, seminars, and artistic performances. They also offer MA-level courses in collaboration with the Central European University (CEU). OSA Archivum actively conducts research on archiving, data management, memory, and forgetting.

As a brand, OSA Archivum is committed to promoting open access, equal rights to information, and the ethical use of private data. They actively participate in digitization efforts, develop research tools such as the Parallel Archive, and work with the International Visegrad Fund to provide research fellowships. With its extensive holdings, commitment to research and education, and dedication to fostering public engagement, OSA Archivum plays a pivotal role in the preservation and dissemination of historical sources