"[P]roduced by the National Archives and Records Administration's Office of the Federal Register (OFR) and the Government Printing Office."
"The Electronic Code of Federal Regulations (e-CFR) is a currently updated version of the Code of Federal Regulations (CFR). It is not an official legal edition of the CFR. The e-CFR is an editorial compilation of CFR material and Federal Register amendments... The OFR [Office of the Federal Register] updates the material in the e-CFR on a daily basis."
Cumulated updates for each title, called Annual edition, are available for bulk download in XML format from GPO's Federal Digital System (FDsys).
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Description based on version last updated August 21, 2015; title from title screen (viewed August 25, 2015).