CDs With Timed Usage



Hello. First time poster here. I’m curious about CDs with timed usage. For instance: a photo cd that can be viewed to a certain date and then rendered unviewable. How is this popssible? Is a code written to the cd when viewed?

2way :eek:


I have never heard about timed CD, but DVD. And it looks like from the article that once played the surface start to darken making DVD unreadable. There is no code, it is a laser which activate the layer.


Thank you. This may be the case. I need to check if it’s a cd or dvd.:slight_smile: