Just google “obama executive order seals records” - you’ll get a ton of hits. It was his first official act, and it bars the US Archivist from releasing any papers about zero.
http://edocket.access.gpo.gov/2009/pdf/e9-1712.pdf
EO 13489. It’s an interesting read, and does not bar the archivist from releasing all records. It does deal with presidential records only, so college transcripts and birth certs would not be covered.