Русско-англо-русский юридический словарь

But when it came to proving his age he had only photocopies of documents and only originals are considered valid. (dailymail.co.uk)

Before 1925, wills which dealt with real property were regarded as title deeds in their own right, and formed a crucial part of the evidence proving title to a particular estate or piece of land. (website of the University of Nottingham)

A military base is a facility directly owned and operated by or for the military or one of its branches that shelters military equipment and personnel, and facilitates training and operations. In general, a military base provides accommodations for one or more units, but it may also be used as a command center, a training ground, or a proving ground. (Wikipedia)

Thus, the onus of proving that there was no intent would be on the party who asserts no legal effect of the document. (LawInSport)