Hi,
Some eZ Publish components in ezp 5.3 alpha 1 have copyright in 2013
Goto http://<yourSite>/ezinfo/about

There we can see the copyright notice Copyright © 1999-2013

The same for the reference of extensions:
eZ Star Rating LS
eZ Google Maps Location LS
eZ Autosave LS

Also the same page has references to "eZ Publish information: 5.2.0"