It is widely known that amendments to the Mexican Law of Industrial Property which have an impact on trade marks came into full force on August 10 2018. Especially relevant is the Declaration of Effective Use (DOU) to preserve trade mark protection. A first DOU is provided for those registrations granted from August 10 2018 and must be filed within three months of the third anniversary of the date of grant of the registration. Failure to file the DOU will cause the registration to lapse. In turn, for renewal purposes, a DOU must be filed. In both cases the DOU's must specify the goods/services for which the trade mark is effectively in use in Mexico. Protection will remain only for those specific goods or services.