Belgium, the Netherlands and Luxembourg are treated as one common area with a uniform trademark law and one trademark office. Since the adoption of the Benelux Trademarks Act in 1971, there are no national trademark laws in any of the Benelux countries anymore.
For further information please see Benelux.
Opposition against designation of IR Mark:
see Benelux (BX)
Practical details on licensing procedures, requirements and effectiveness are available in our publication on this topic here