Vietnam applies the first-to-file principle for trade mark registration and does not require evidence of use or intent to use at the time of filing, or for renewal. For maintaining a registration, though, a trade mark owner or its licensee must use the mark or risk cancellation for non-use. The IP Law stipulates that if a mark has not been used by its owner or a licensee without justifiable reasons for five consecutive years prior to a request for cancellation, except where the use is commenced or resumed at least three months before the request, the registration is vulnerable to cancellation. However, the trade mark owner is not required to submit evidence of use on a regular basis – only when the mark is attacked for non-use.