PARIS — Vivendi’s Canal Plus Group is holding exclusive negotiations to acquire ITI Group’s 56% stake in Polish TV operator TVN.ITI expects to complete the sale by the end of the year. TVN owns free-to-air channels, pay TV platform N — the third largest in the country — and website Onet. Canal Plus is already a major player in Poland via Cyfra Plus, Poland’s second largest satcaster with 1.5 million subscribers. Deal would allow Canal Plus to consolidate its position in Polish pay TV and step into the free TV market. Earlier this year, ITI had discussions with various potential buyers, including Time Warner, which was considered a frontrunner, along with Vivendi, to snap up TVN.