The specific request for "jpegrepair.ninja licence key" cannot be fulfilled as it involves circumventing software licensing, which falls under copyright infringement. I can, however, provide a detailed overview of the software itself, its functionality, and the legal avenues available for obtaining a license.
Q: Can I use JPEG Repair .Ninja on multiple devices? A: Yes, some licence keys allow for multi-device use. Check the licence agreement for details. jpegrepair.ninja licence key