Reason im asking is because i want to copy my computer monitor onto a TV (going through a surgery coming up next year and am thinking i might be able to do basic stuff, like watching movies and such while lying in bed not looking to steal anything from my cable provider)
You will be fine with this product considering both the monitor and the television are HDCP (High-bandwidth Digital Content Protection)-compliant.
It should just filter the image to the devices and they will take care of the "handshaking" that is needed.
The reason this device exist is because it is a real-world scenario that people have (needing to mirror a display) and it doesn't infringe on or attempt to copy digital content. It is just mirroring it.