Copyright
You have edition rights over this. This edition is yours, and if anyone copies this edition, they get in trouble. You have copyright.
はんけん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
この手紙には、版権に関する契約更新予定日が記載されています。
This letter states the possible contract renewal date for the copyright.