CD rot/bronzing issues?

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CD rot/bronzing issues?

I know there is nothing i can really do about it but i decided to install TW2 again and do another play through and i found my disk has begun bronzing around the edges and i now in an unreadable state. anybody else have this issue? my copy is from the original release in 2011. Think I would be able to find another original boxed version to replace mine?
 
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