if you've gotta go with DRM, indefinitely is the only way to go imo. some sites also use non DRM lower quality videos and only use DRM for their top quality versions. that makes me think that some people who use DRM are more concerned with saving their bandwidth rather than protecting their content.

as i understand it, mac users cannot use DRM. if true, say goodbye to around 10% to 15% of your potential members - and also your current members...