Hi, I'm Ron. Thank you for asking a question. Is the connection from the DVR to the T.V. a HDMI cable or red, white, and yellow RCA cables?
Usually the RCA cables have signal scramble that the t.v. will not have a problem with, but the DVD recorders and VCR's could not record. The HDMI has a similar protection that seems to be ignored when using video capture technologies. They sell external hard drive devices that can capture video and even convert to HD. I mention this because there are video capture cards that you can install in a desktop that work the same way. You would have to research the capture card closely to be sure it can do this. Some use the computers technologies to do most of the work and store the copied file. Others depend on their own technology and then use the computer for the data storage.
Even if the video capture card can not do it, but it will allow you to view the signal on your computer just like the t.v., then you can use video capture software to copy it while it is playing on your computer.
Sounds like a lot of work, so I bought an external device for about $ 120.00 that does the job in one shot. Works for DVD players if you want to copy a protected DVD while a DVD recorder can not.
It copies the coded signal just as if it were a t.v. or monitor.
Then you can copy the file on the gadget and burn it to a DVD all over again without the protection. It is legal as long as you are copying something you paid for like a DVD or a purchased cable/satellite signal on the DVR.
And do not sell to someone else. It is simply your protection of the purchased video.