Selling access to limited time streaming video

Hi all,

We want to sell videos of classes, however we do not want the visitor to be able to download the videos outright. We want the videos to be available to them for a certain period of time, so we need either to:[list=1]

[]Give users access to the streaming video upon purchase OR

]Allow visitors to download the video and have the video automatically delete itself after a period of time (not sure if this is even possible)


Can anyone let me know how we could do this?