Tvheadend

I always wanted to setup a tvheadend server but never got around to it. I just used a Vader's sub and it allowed 5 devices in the house which I was happy enough with. The service lately is really bad so I've decided to switch provider's. The new guy only allows one device per IP but will give me a m3u link. My question, if I setup tvheadend and insert his m3u can I send the stream to all other devices in house without him knowing.