This video discusses the plague of pirated software causing issues for many people with their robots through limited functionality of its features.
Don't let yourself become a victim, ask the vendor/seller if the Mach3, Mach4 software license they're offering is real. If you're purchasing overseas, and your hardware includes a Mach3 license then there's an extremely high probability its pirated.
Here's a link to Artsoft the creator of Mach3, and Mach4 to check your software. https://www.machsupport.com/contact-us/
If you have questions, require a consultation, or a quote please message me direct at [email protected] or through my eBay store here https://www.ebay.com/str/edealersdirect