Show HN: eBook Defender – No DRM Invisible Watermarking Tool

My first real "business" was running one of the largest ebook piracy sites in the world. One thing that pops up when talking to people who upload is they are far more hesitant to share books they have bought when they are worried that they will have hidden watermarks on them.

I also hate DRM. It’s a pain for legitimate users and trivial for someone like me to remove. So I've built Ebook Defender (name a work in progress) a tool to invisibly watermark ebooks without DRM. The watermarks are unnoticeable to readers and don’t affect formatting.

This is a working demo. You can upload an EPUB, add a watermark, and verify it. The full version supports more formats and can scan sites for watermarked copies (this largely uses existing technology, it will follow Usenet, Torrents, and also automatically track sites like mobilism etc).

The reason this isn't a fully featured SaaS or something is honestly, I don't know where to go from here. My background isn't in this space, my contacts within this space don't exactly return my emails, and I don't know what to do with it. Please feel free to break it!

I would love your feedback on any part of this whole thing.

Thanks!

Oh: If you want an epub to test with Gutenburg.org has a lot here's one https://www.gutenberg.org/ebooks/1661.epub.noimages