A shopify plug in for automatic video watermarking

The software is being thought as a shopify plugin, run from my computer. I sell videos produced by myself in a shopify store. For selling digital stuff, shopify request the files to be uploaded to their site and then they deliver the file once the customer buys it.<br />The proposal of the software if fighting piracy through a very elementary video watermarking strategy. The idea is to print somehow in a non visible way a date of upload in all videos that have had more than 3 sales in any window time from current day to a month ago. The software, installed in my computer, should carry out the following actions:<br />Check daily which videos have sold more than 3 units in my shopify store<br />Looking for those video files in my computer and watermarking them with today’s date<br />Reuploading them to shopify with this watermark<br />Keeping a table per video of the reuploading dates. Then, if at any time I find a video of myself in a file sharing site, I will need to manually download it and the software should allow me to turn visible the watermark. In this way, I will know when the video was uploaded. Then I can see which were the customers who bought that specific copy, from the date of upload to the following date of upload.<br />This would give me a number of “suspicious” customers, any number between 3 and whatever I sold of one single video in one day, let’s say 20. Let’s suppose I have 15 suspects. Then the next time I find another video in a file sharing site I do the same and this second list will be crossed with the first one and  this will narrow the list. Given my estimated sales volume, in no more than 2 or 3 found files I should be able to “catch” the pirat.<br />