In Vietnam, a signed contract that is unsealed risks a determination of invalidity by a Vietnamese court. The risk arises from customary practice combined with an absence of provisions explicitly dealing with the legal importance of corporate seals under Decree 58 of the government dated 24 August 2001 on seals. On 1 April 2009, the government issued Decree 31 to amend a number of the provisions in Decree 58. However, Decree 31 does not clarify the legal importance of a corporate seal on contracts. Consequently, the risks of unsealed or improperly sealed contracts remain, so lawyers and their clients face years of additional discussions about the theoretical importance, and practical necessity, of complying with an obligation arising from custom and ambiguity rather than law.