How do I secure uploaded content from being directly accessed on the web?

[zoldos]

So I found out that sites like "Primeyes" (not sure if it's still on-line) and other A.I. powered sites/utilities have the ability to view and maybe even index uploaded content/media on my forum without being logged on even though everything is member's only, and people must be logged in to access such things.

I tested it myself and confirmed this. Also, if someone knows the exact URL of a picture/video/zip, etc., then anyone on the web with this URL can view the content on my...

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How do I secure uploaded content from being directly accessed on the web?

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