how has Fortinbras' threat to denmark been eliminated?

Voltimand and Cornelius have talked to the King of Norway. The King said he took Fortinbras to task for staging the initial attack and Fortinbras promised he wouldn't attack them again.

so the King of Norway stopped him?

yup, on certain conditions

what were the conditions? do you know? and thanks!

Fortinbras army can have passage through Denmark on their way to attack Poland.

Um, what are conditions exactly? I don't know what else to call it.... ya know?