DRM patent à la Microsoft: Use built-in camera to count viewers; deactivate stream if too many heads are counted. (link to the patent)

Extract:

“A method of distributing content to a user, comprising: providing a selection of content available to the user; for each content, presenting a licensing option comprising associating a performance of the content with an individual user’s consumption of the content at a display device; receiving a selection of one of the content and a license display option for said content; presenting the content to the display device if a number of user performances allowed for the content is equal to or less than the license option for which the selection is received; and monitoring the presentation of the content at the device to determine the number of users consuming the content during the performance. “

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