Flash :: Content-Delivery-Networks (CDN) Like AWS Cloudfront, Policies?

Is this a typical 'CDN' policy ? Is this to encourage customers to host only such content that is going to be around for quite a while, and going to see probably a million downloads I started looking at AWS Cloudfront for it's ability stream RTMP media (aka Flash server like behaviour) to host video content. That is to say, I am not too concerned about the "distribution close to client" benefit. However, what surprised me is a clause on the AWS Cloudfront pricing page, that says something like the first 1000 'cancellations' (per month) are free. I interpret 'Cancellation' to the be the act of removal of content that I no longer wish to serve via the CDN. Is that right ?

My requirement is the ability to serve media content (streaming audio, streaming video) which isn't shared with general public or a large audience. It is something like each of these files have a lifetime (or relevance) for only few days (a week or so, at most), and each file will be viewed only by a small handful of people/consumers (e.g. 1 file viewed by an average of 3 people, maximum say 10 people). Also the content's privacy needs to be maintained, so an accidentally shared media URL shouldn't allow an unauthorized person to access it. In this case, is it right to assume that CDN is an overkill, not the right solution ?

I was drawn to AWS CF for it low price (at least, low entry price) for RTMP streaming abilities. What other options could I consider. For me, high availability and round-trip-time are secondary... primary concern being cost, i.e. it needs to be as low as possible. On the question of "how low", I'd say low-enough for developing economies, s.a. in Asia, South America and Africa.