How do I open this game?

I recently bought some shrink-wrapped bargain bin games. Most of them seem like normal reprints of games but one has an extremely strange case that I can't figure out. (Apologies for the potato quality photos)

This seems to be a normal dvd-type case expect that there is an extra red piece of plastic that fits into the edge of the case and extends behind the disc, preventing me from removing the disc normally.

I've already forced the case open somewhat to get this far, as the red piece does had teeth that fit into both edges of the case, holding it closed.

I'd like preserve the case, however, and not force the case anymore then I have to.

Some other things to note about the case:

• I believe it's a reprint imported from the UK
• There is some black material inset in the back of the red piece
• There seems to be a bit of metal in the "head" of the red plastic, where it holds both sides of the case together (note the shine coming from inside it in the third picture)

I'm honestly at a loss as to how this case works and how I can remove the red strip. So how do I open my game?