Successful implementation of a de-perimeterised strategy within an organization implies that the perimeter, or outer security boundary, was removed.
Metaphorically, de-perimeterisation is similar to the historic dismantling of city walls to allow the free flow of goods and information.
[2] Claims made for removal of this border include the freeing up of business-to-business transactions, the reduction in cost and the ability for a company to be more agile.
The work, particularly by the Jericho Forum, on de-perimeterisation has fed into two key areas of computing: More recently the term is being used in the context of a result of both entropy and the deliberate activities of individuals within organizations to usurp perimeters often for well intentioned reasons.
The Jericho Forum paper named "Collaboration Oriented Architecture" refers to this trend of de-perimeterisation as a problem: Problem The traditional electronic boundary between a corporate (or ‘private’) network and the Internet is breaking down in the trend which we have called de-perimeterisation.