No, private family footage should remain private unless explicitly released for a stated use, just as for any other family.
Even for pictures owned by others, iirc, if consent has not been obtained faces are supposed to be pixelated out if published etc.
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So documentaries on the royals - or anyone else - should only show the things they approve of?
No, that's not what I was saying. A documentary can show other footage, but should not include private footage without consent. If someone makes a documentary about you, you would hardly be happy for them to be able to raid your private archives and spin anything they find one way or another.
If they thought you had committed a crime they could of course report you to the authorities who would be able to obtain any relevant evidence under warrant.
Similarly, am against people taking pictures at long range, snooping on private behaviour etc.
The "right to be forgotten" is a different matter, a travesty really.