There are 7 products.
Enigma2 is a Linux based OS which can be loaded onto Linux based receivers.
The key aspect of Linux based receivers (satellite, terrestrial, cable or a combination of these) is that they have a PC processor which allows the firmware to be upgraded by user (as it is effectively an Linux based computer than a patched receiver). An ethernet port which allows access of IPTV, online 7-Day EPG and networked file sharing services. Plus, normally comes with a CAM (Conditional Access Module) to allow a smart card to be inserted to give access to encrypted channels.