Video Library Subscription Service (online, SAS) e.g. PHP, Python, Rails, Flash, Amazon S3 etc. (I don't mind which system)

I am looking to have a video training library? developed. Similar to say [login to view URL] I have lots of videos. I want to sell places a subscription to access the videos. I will give the person buying the subscription an Admin login. They will then be able to create say 3000 user logins to log in to the system. These are the components that are needed: 1) Admin user interface for buyers 2) User user interface for the buyer's users 3) Top end admin UI (for me to monitor subscriptions etc) 4) A flash video player for the content to be streamed (I want the videos to be protected so that users can not easily download them when watching them). 5) I want all of the user logins to be able to be restricted to one IP address, or a range of IPs. Basically I only want the user to be able to log in from one address. 6) Integration with Paypal for the payment system for the user to pay for their subscription 7) There needs to be a search facility, so I need to be able to assign keywords to videos for the meta data 8) The whole system should be secure to login 9) I need to be able to easily add new "products" (which contain videos) at any time. 10) The system needs access levels. e.g. they will be able to access different "products" depending whether they have paid for them or not. 11) The user shouldn't have to download any extra plugins to access the system. 12) We should be able to send notices to the admin buyers, e.g. have a notice pop up on their screen saying "buy this". 13) Ideally (not essential) we would like some sort of? analytics, so we can view long people have spent viewing videos etc. 14) Admin users should be able to set normal users "reading lists", i.e. to watch lists. I don't care what system is used to build it, you suggest to me. I don't know if Ruby on Rails would be best. I want it to be fast and affordable to maintain, so I'd suggest that the videos would likely be best delivered by Amazon's S3 storage and Cloudfront delivery system so videos load really fast. I will provide all of the design work for the system. And can code HTML templates for all pages so you just need to link them up to your system.