I didn't understand the part "cater for different copies" - my english vocabulary is not perfect.

Anyhow, what I want is that I want them to only be able to upload the same image ONCE. However, if they for example crop the image, the image won't be the same(though the object will probably be the same - but it's not the same image), they will be able to upload that.

What I mean is basically I want to run a check if they already uploaded the FILE once before. But since they can change the filename in the case - using the filename is not the best option for me.. if you understand what I mean?

I really hope I'm explaining this so you understand.

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