Can I use audio containing Canadian ATC/broadcast radio transmissions in a YouTube video?
In countries where it is illegal to listen to ATC chatter like the UK, it is also illegal to post it, and you can see this on LiveATC, where you can easily listen to YKZ, YYZ, YVR, YTZ, and YHZ, etc. in Canada, but you can't listen to UK airport feeds or sectors for example LHR, LGW and MAN. 

So assuming that liveatc is not an illegal orginization, (we know that for sure because literally the #1 thing that comes up when you search on google atc, liveatc comes up. And if it was illegal, the RCMP would have taken down liveatc at least in canada years ago!) we can say that no, posting atc chatter online is not illegal in Canada.