"The Messenger of Allah [SAW] said: 'We have had a ring made with an inscription, and no one else should copy this inscription.'" (Using translation from Nasāʾī 5281)
قَالَ رَسُولُ اللهِ ﷺ «قَدِ اصْطَنَعْنَا خَاتَمًا وَنَقَشْنَا عَلَيْهِ نَقْشًا فَلَا يَنْقُشْ عَلَيْهِ أَحَدٌ»