evidence: You can complete the declaration of marriage online on The Agency of Family Law’s website, familieretshuset.dk. Otherwise, you can complete the declaration as a PDF file. [...] Note: You must apply for a marital licence and a Certificate of Marital Status from the Agency of Family Law if one of you: [...] In addition to the declaration of marriage, it may be necessary to attach special documentation such as baptismal certificates, divorce decrees and probate court certificates. You can see from the declaration of marriage what other documentation might also be needed.