>>http://www.abc.net.au/news/newsitems/200608/s1720606.htm
>>
>>I've already seen the famous Yalta photograph retouched for the history textbook, so FDR has nothing in his fingers.
>>
>>What's next? Purging congressional videos?
>
>Yup. The famous photo of the Beatles crossing the street, is altered also.

But in cases like the Beatles picture it matters when and why.
If it was done for purposes of, say, an album cover, that's common. How many models' photos do you think make it to a magazine unretouched?

I have this silly idea that historical pictures, and anything (films, video tape, photos, etc.) released for public consumption ought never be LATER changed unless there is clear notation of such. Else we can no longer believe our eyes anymore.