Danish to English Law/Patents Law: Contract(s) Contractual dispute

Retten tillægger således den almindeligt gældende koncipistregel afgørende betydning

I've found the below explanation, but its a little long-winded.

If a contract between two parties was unilaterally
made by one of the parties – and especially if the contract was not subsequently negotiated
as such – certain problems in understanding specific provision of the contract might later on
be interpreted against the author of the contract (known as the “koncipistregel”)