If you are going to use it in public parking lots, for about $8 or so, there is a lock and cable for it available from the dealer. The cable connects one side of the cover to the other underneath the car and is locked on. I am sure any generic steel cable and lock would accomplish the same goals.

It is obviously not foolproof, but at least it makes someone work to steal the cover if they want to. This way, instead of someone simply walking off with it, they will have to cut it off.

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Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record