There are various high-performance Ethernet connectors and RJ45 industrial plugs (like the RJI RJ45 plug or the RJ point five system ) that use similar alphanumeric codes.

The code typically refers to a specific entry in the DLsite database, a Japanese digital distribution platform. This specific product code belongs to the game " Boku to Kanojo no Mahou no Card

The search results also mention the , but this appears to be a naming coincidence in third-party search indexes; "RJ080245" is uniquely assigned to the software mentioned above in Japanese digital distribution databases. Anime | Manga | Games | MMORPG | Friendly Community