If you are looking for an official guide or "paper" on how registration works, here is the factual information from the Embird Official Site Official Registration Process Paid Licensing
: Embird uses an activation system to ensure each license is used according to the EULA. The software creates a unique installation ID linked to your hardware. Embird Embroidery Software Trial Options Evaluation Version : Embird offers a limited trial version Embird Registration Key Free
: Using unauthorized keys violates the software's license agreement. For a completely free alternative, many hobbyists use Ink/Stitch , which is an open-source embroidery plugin for Inkscape. Impact Digitizing alternatives or more information on the Embird trial limitations Registration - Embird Embroidery Software If you are looking for an official guide
: Files downloaded from unofficial sources are a high risk for infecting your computer. Software Instability For a completely free alternative, many hobbyists use