What does it mean by "in one's own right"?

From the first century BC on, Greek sculpures and copies of Greek sculpture were found in many upper-class homes in Rome. Many of these copies wer3e very good, and today much of Greek sculpture is known only, or mainly, through Roman copies that are, of course, now very valuable in their own right. what does it... show more From the first century BC on, Greek sculpures and copies of Greek sculpture were found in many upper-class homes in Rome. Many of these copies wer3e very good, and today much of Greek sculpture is known only, or mainly, through Roman copies that are, of course, now very valuable in their own right.

what does it mean by "in their own right"?

In architecture the invention of cement made all the difference. Toward the end of the third century BC, possibly via Africa, it was founded that a mixture of water, lime, and a gritty material like sand would set into a durable substance tht could be used either to a bond masonry or as a building material in its own right, and up to a point, could be shaped in a mold.

what does it mean by "in its own right"here?

are the above two phrases "in their own right" and "in its own right" the same?

thanks a million.
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