I am musing about possibilities to express rights and related concepts - rights, dues, claim to something, entitlement, just/justice etc. - in NeoQuenya/NeoEldarin. I have not really been able to find any words in this semantic space in the attested vocabulary (there is a deleted Gnomish word for "rights"), so we'd need to resort to a metaphor or neologism.
Latin ius, the origin of E just and justice, leads us to "law, rule", for which we have sanye from STAN in Quenya, yielding potential *sanyea "just, righteous, lawful". But words related to rights, dues, entitlements are not covered by that. Perhaps the irregular verb oa- "possess" could be a source of words in this meaning (my Hungarian mind is coming up with a future passive participle like *auvaina "that is to be possessed, owned" to express "due"), but there are probably other possibilities out there, too.