The database used by the search forms is the same data that is used to generate the printed SCA Armorial and SCA Ordinary. It is a flat text file roughly 5.3 megabytes in size. The file format is documented online.
The database is protected by copyright, but that broad blanket permissions have been granted for verbatim redistribution and personal use. See the copyright notice for details.
You may be able to download the database by anonymous FTP from www.reaches.midrealm.org:
You can purchase the database on IBM-format 1.44MB floppies by sending a check or money order for US$5.00 to:
SCA Inc. - Free Trumpet Press West 877 San Lucas Ave. Mountain View, CA 94043 U.S.A.