Wikipedia:Use of non-free content survey/8
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Potential for replacement
[edit]Under the current non-free content criteria, non-free content is used only where no free equivalent is available or could be created. This allows important non-free historical photos and commercial properties (e.g. album covers, logos) to be included, but excludes most non-free photographs of living people and technical illustrations as equivalent free photographs and illustrations could be created by Wikipedians.
In my opinion, the requirement that non-free content not be "replaceable" is: