Interesting! Researchers have successfully listened in to VGA signals using professional equipment [1]. Could the same be done with rtl-sdr receivers?
One application I can imagine is to build an osmo-fl2k transmitter that looks like a USB memory stick, ask someone to plug it into the projector computer at church, and then record the video stream with the lyrics. Most projectionists have been helpful and willing to share their PPT files so I can study Chinese, but some are refusing to share them because of copyright issues. The translated songs were not officially licensed, so they're refusing to distribute their data. It is usually possible to ask someone to plug in a USB device (e.g. "to charge"), so if that's a possible entry vector then it would interesting to develop the transmitter further.
"steal" implies ownership. Their translations aren't officially licensed. They refuse to share it because they don't want to be sued for making illegal translations. But that also means I can't sing along with them, because I can't read the Chinese characters on the screen (I need to copy-paste it to my app to translate it to pinyin). When humans aren't cooperative, I try to find ways to work with the machines to achieve the goal.
One application I can imagine is to build an osmo-fl2k transmitter that looks like a USB memory stick, ask someone to plug it into the projector computer at church, and then record the video stream with the lyrics. Most projectionists have been helpful and willing to share their PPT files so I can study Chinese, but some are refusing to share them because of copyright issues. The translated songs were not officially licensed, so they're refusing to distribute their data. It is usually possible to ask someone to plug in a USB device (e.g. "to charge"), so if that's a possible entry vector then it would interesting to develop the transmitter further.
[1] http://www.cl.cam.ac.uk/~mgk25/iss2006-tempest.pdf