A softcam is: Software for emulating a Conditional Access Module.
A conditional access module is an electronic device, usually incorporating a slot for a smart card, which equips an Integrated Digital Television or set-top box with the appropriate hardware facility to view conditional access content that has been encrypted using a conditional access system. They are normally used with direct-broadcast satellite (DBS) services, although digital terrestrial pay TV suppliers also use CAMs. PC Card form factor is used as the Common Interface form of Conditional Access Modules for DVB broadcasts.
Some encryption systems for which CAMs are available are Logiways, Nagravision, Viaccess, Mediaguard, Irdeto, KeyFly, Verimatrix, Cryptoworks, Mascom, Safeview, Diablo CAM and Conax.
You can install a softcam by the PLi feed:
Menu > Plugins > Download Plugins > Softcams.
Or install a softcam manually by storing the *.ipk file on a storage medium of your enigma tuner (In the root directory) and then:
Menu > Plugins > Software Management > Install local extension > select medium where you store the *.ipk file.
Note: there is a "new" Cccam version v2.3.2, which is also compatible with newer ARM based receivers. Remember that it is still closed source!