I believe fileattach has support for SHA1 which may work? but I can't say for certain. Either way though if a user wants to grab a video they can do fairly easily. I've found that vimeo is very good with their privacy settings and make it quite hard for users to see, rip or share a video if they're not authorised.
Hi Tnx, i'll look into 'fileattach' not sure how that should work. I know people can rip the video if they try hard enough. The idea is the authorised user won't do that but could send a link to someone without realising that that mail could go everywhere so its to prevent mistakes.
Tnx
RDG
I would go the vimeo route personally. I know quite a few online training academies use that to stop people sharing links who haven't paid for a subscription.