The Marrakesh Treaty of 2013 sets copyright exceptions for works which benefit the visually impaired. The exceptions allow the creation of derivative works in braille, audio, special font size etc without Copyright owner consent. It is usually estimated that up to 10% of works might need to be made into such formats. 74 countries are members so may now amend their copyright laws once it comes into effect in October 2019. WIPO administers the treaty. So far only Singapore has joined in SE Asia, but Vietnam is thinking about it, according to delegates at a November 2018 seminar in Hanoi by the National Committee for the disabled.