The sharing of technology has emerged as a sticking point between Renault and Nissan as the pair negotiate an overhaul of their decades-old partnership, two people familiar with discussions told Reuters.

The French and Japanese automakers said this month they were in talks about the future of their alliance, including Nissan potentially investing in an electric vehicle business being spun out of Renault.

Those discussions have included consideration of Renault selling some of its roughly 43% stake in Nissan, Reuters previously reported, a move that would put the pair on a more equal footing and mark a seismic shift in an alliance founded in 1999 and long driven by executive-turned-fugitive Carlos Ghosn.