The legality of key duplication depends on the specific circumstances and applicable laws and regulations in the jurisdiction in question. In many cases, it is legal to duplicate a key as long as the key belongs to you or you have the authorization of the owner to make a copy.
However, there may be situations where key duplication is prohibited or restricted by law. For example, in some jurisdictions, it may be illegal to duplicate keys that are marked “Do Not Duplicate” or “Unauthorized Duplication Prohibited.” Additionally, keys used in high-security applications, such as those used in government facilities or for certain types of equipment, may be subject to stricter regulations regarding duplication.
It is also worth noting that some keys may be subject to patent protection or other intellectual property rights. In such cases, it may be illegal to duplicate the key without the permission of the patent holder or owner of the intellectual property.
If you are unsure about the legality of duplicating a particular key, it is always best to consult with legal counsel or seek guidance from the appropriate authorities before proceeding.