First we create a solution that's right for you. From what you want to say, to the location and how your content gets delivered.
Digital signage should be a long term investment, more than just a nice screen, and it's necessary to manage that. Lots of projects start with good intentions but quickly become stale and so get switched off.
A secure system and software are an obvious must with any digital signage project. Many current systems are wide open to abuse, which can damage an organisation.