This appears to be closely based on:
Copying or otherwise using the work of others without acknowledging them is plagiarism. As @steemcleaners says: "Plagiarism is the act of copying or stealing someone else's words or ideas and passing them off as your own work".
Unless I am mistaken, that is what is happening here.
If you are the original author of this article/video, please let me know.
To avoid this sort of message in future, please post articles that are original content.
If i give copyright credit to them can i use this content..?
You should always acknowledge content that isn't yours. Even then, just copying content from elsewhere on the web can attract flags - just not as many as if you try to pass it off as your own.
Whatever you might have been told about steemit, people here react best to original work. If you try to misuse the system, you will attract the wrong sort of attention - you can loose post rewards and your account's reputation.
Thanks for For your clarification.
I'll remove my flag - for now. I will come back to check up on you though. If I catch you using someone else's work without properly linking to it again, it will not be pretty.