right holder; rightful claimant; beneficiary
Legal and formal term for a person or entity that holds a right, such as a copyright holder, patent holder, or beneficiary of a claim.
The copyright holder can authorize the use of the work.
As the patent right holder, he receives licensing fees.
co-creditor; joint obligee
Compound of 権利 (けんり, 'right') + 者 (しゃ, 'person'). The word follows the standard pattern of adding 者 to a noun to indicate the person associated with that noun.