Copyright
noun
著作 is "writing" or "authorship." The rights that writing has is what's known as copyright. Note that 著作権 refers to copyright for anything, not just writing.
ちょさくけん
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. Will help to know 著作 first, too.
著作権の対象となるかどうかに関わらず、他人の作品は使用しないでください。
I don’t want you guys to use someone else’s work regardless of whether or not it is subject to copyright.