A DRM-free invisible watermarking tool for ebooks. Upload an EPUB file, select "Encode Book," and download the modified file. To check the watermark, upload the modified file and select "Check Book." This is a demo version.
Full version is capable of epub and mobi files (and all formats could be added), it can also scan piracy sites for the book's signature and report uploaded copies.
Looking for a strategic partner: If you're a publisher/author interested in using this tool or a potential partner who can help develop it further (or license it for existing software), feel free to reach out:
I'm a Canadian PHP & Go full-stack developer passionate about design and building cool stuff. Currently seeking a job to support starting a family. If you have an opportunity (even support, sysadmin, etc.), let me know!