The breach that was the fly in the ointment of the Yahoo-Verizon deal is one of many now surfacing as security of acquired firms starts to become a point of negotiation.

The mergers and acquisitions (M&A) market for software broke a lot of records last year, as investors took advantage of the convergence of cheap money and of society’s growing dependence on software in every facet of personal and business life. But as the feeding frenzy continues, there’s one big sticking point that rears its head more frequently than any other deal blocker in the software M&A game: cybersecurity.

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