This poster is signed by Sam Neill, Laura Dern, Sir Richard Attenborough, Jeff Goldblum, Joseph Mazzello, Ariana Richards, Samuel L Jackson, Wayne Knight, BD Wong and Miguel Sandoval along with acclaimed, Oscar winning director Steven Spielberg. This item comes with a Certificate of Authenticity from a third party authenticator. This Certification of Authenticity does not imply that the item will be certified by any other rival authentication companies. The accompanied certification is the only certification the auction company can confirm. These items are being sold as collectable pieces and there is no guarantee that this item can be resold on any online marketplace. Each of these companies has their own policies and politics.