How do the security devices on DVDs work?

Question

This always baffled me. I buy a DVD covered in stickers saying "security device enclosed" but I never see any security devices?!?

Answer 1

This probably refers to "store" security; preventing someone from getting the DVD without paying.
Can be as simple a very thin magnetic film inside the package that triggers an exit alarm if not demagitized by the cachier.

Answer 2

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