> ...WorldVistA EHR is a repackaged and extended version of the VistA
> health care information system (HIS) developed by the US Department of
> Veterans Affairs, and in the public domain through the US Freedom of
> Information Act.
No. It is in the public domain through the US Copyright Act[1]. FOIA
merely gave you access to a copy of it (assuming that was how it was
acquired: a brief search does not support that claim).
[1] Assuming that it was written entirely by US Government employees on
government time.
--
John Hasler