[ccache] GPLv2 or v3 - Which License is applied to ccache-2.4 ?

[y.m0718 at gmail.com]

Hi, 

The License of ccache-2.4 is GPLv2, and license page(http://ccache.samba.org/license.html) says v3.
Which license is applied to ccache-2.4?
(Is license page is only for current version?)