e recipient does not have access to.
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  <em>Consideration:</em> Note that providing resources with links to other resources that are not accessible to the given user, does still expose the id (identifier) of that second resource. That id (identifier) should not directly expose information, but the id (identifier) may be seen in other resources as links also. The id (identifier) can then be used to correlate a set of resources, and this correlation needs to be considered in Privacy risk exposure. 
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