These files are not covered by the GNU General Public License.

48.rom

    This is an image of the Spectrum 48K ROM.  This code is (c) Copyright
    Amstrad PLC.  They allow this to be used for emulation purposes.

zxspec_v2.rar

    A Spectrum Keyboard font, (c) Copyright Paul Reid (TracerTong).

    http://tracertong.co.uk/ttf/2010/05/zx-spectrum-keyboard/