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How can I get a snapshot of a website that can serve as an evidence of its current state?

There is a website that requires authentication that I want to take a snapshot of it as a proof that the site did list my information at this time. So in case they take down my info, I could say I have a proof that they did have my info there before they removed it.

I could take a screenshot of it but it wouldn't be a solid evidence because screenshot image could be said to be photoshop'ed.

What would be a good way to do this?

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DO you need this for legal reasons, or for something else? There's different criteria for either. – Journeyman Geek Nov 12 '12 at 7:22
Not for legal reasons at this moment, but if there is something this solid that can be used as legal evidence, then it will be even better. – xenon Nov 12 '12 at 7:56
Could you not simply PrtScrn the page? Or do you need more than that? – LMS Nov 12 '12 at 7:58
@LiamMcSherry The OP stated that screenshots could be photoshopped. – slhck Nov 12 '12 at 8:02
@slhck Anything can be faked these days, anything. It all boils down to credibility as eluded to by RedGrittyBrick. – Moab Nov 12 '12 at 15:14

Pay a lawyer to use your credentials and take a screenshot and write a letter confirming that the details were present on that website at that time.

The legal arrangements in some countries define a "notary public" role who may be able to provide this sort of service.

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