[bragr]

Interesting write-up. Does anyone have any context about Fujitsu RELC? Why a proprietary algorithm? Any particular advantages or features?

[ge0rg]

Looks like it was invented by two Fujitsu engineers, is free of patents and maybe was optimized for hardware implementation? I've linked some Japanese sources in the post, but I don't speak Japanese and the auto translation is not easy to read.