Intellectual property law is basically territorial, that is, your right with respect to your trademark is confined to the country in which it was applied for and obtained. Therefore, if you export goods bearing your mark and you have only obtained protection for that mark in your country then your mark is vulnerable in the export market. It is then important if you are in the export business that you register your mark in the countries to which you are exporting or intending to export so that your mark is protected in those countries as well. For a guide on how to protect trademarks abroad see Protecting Your Trademarks Abroad: Twenty Questions About the Madrid Protocol. [PDF].