A device for tamper protecting and authenticating a liquid product distributor including a container with a cylindrical neck with a seal engaged therein, further including an indicator element with a collar which is elastically inwardly collapsible and whose largest diameter is greater that the neck internal diameter and which is removably disposed on the lower part of the seal and is trapped in the container after a forced penetration through the neck. The indicator element includes a sleeve in which the lower part of the seal is radially clamped.