Idea of Bluelock Icon
It is a shape like a tilted rectangle with rounded corners, but the upper left and lower right areas extend beyond the corners of the rectangle, and it is tilted so that the upper right corner is at the top. Inside this shape is another tilted rectangle, this one with sharp corners.
This is a Bluelock icon. It is available in PNG and vector. Downloading is free for PNGs up to 100x100px.