An Idea - Having a Button for DVD's Bluray's When You Have the Film in Your Collection

First time posting on here,I have a lot of DVD's and Bluray's and not sure what or how many I have in my collection.Recently IMDB have put a button on the films you can press to say that you have watched the film,great idea!My idea is just have a button at the side or underneath which you can press that indicates you have got that particulat film on DVD or a Bluray I have in the past bought a DVD then got home and realised I have already got it.My collection of films is spread over a couple of rooms and it's hard to keep track of,where as a button on IMDB would be ideal.