The security cables are not swaged the same way that an winch line would be. You require a flemish eye splice with a swaged end for proper loading. I can see in that picture that they're probably using an aluminum swaged end. Also, you're going to want a thimble in the end to keep the cable from being bent below it's safe minimum bend radius for loading.
Flemish Eye Splice:
Standard swaged cable:
The main difference is that the flemish eye splice is distributes the load back into the body of the cable evenly. In theory it retains almost all the strength of the cable because of the way it inter-twines back into itself. This load capability is decreased dure to the the little bit of pressure that the cable is subjected to from the swage sleeve that is crimped onto the cable. A standard nico sleeve actually presses the cable against the "dead end" that is just doubled back and squeezed together. This can decrease the effective strength down to about 60-70% of the cable.
Also be advised that the style and material of the cable will also be a big part of the breaking strength of the cable. 6x7, 7x19, IPS, or EIPS, etc.
Now with all the decreases in strength from the crimping/swaging process, you add a SWL (safe working load) factor to the equipment. This is usually 5:1. That means that if the total strength after swaging is 5000lbs, then you have a SWL of 1000lbs. This is taken into account for the aging of the gear, wear and tear, any damage it may have, etc.
If the company is willing to give you a written on paper, a safe working load that includes it's swl design factor, then (and only then) would I use it....if it is actually strong enough. Just remember, if it fails...it may not just be you on the receiving end of a flying piece of steel cable or shackle.
If you want some really good reading regarding wire rope and it's construction, here's a webpage for you:
http://www.inventionfactory.com/history/RHAwire/introwr/introwre.html