A closed solution
A non-open standard
In those cases you are risking vendor lock-in. And by doing so you are committing your company to either a perpetuity of lock-in, or to a future expensive remediation to restore your options to the point where you can make alternative choices. The smart way of doing this is to consider, in terms of analysis to aid decision making, the cost of lock-in up-front, as a deferred expense, a liability. When this is done you can more accurately make comparisons among available solutions, closed and open, knowing that you are fairly accounting for the true economic costs of each choice."