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This is achievable by product activation (Windows is a good example). Basically, for a customer with a valid license key, you need to generate some "activation data" which is a signed message embedding the computer's hardware id as the signed data. This is usually done over the internet, but only ONCE: the product sends the license key and the computer hardware id to an activation server, and the activation server sends back the signed message (which can also be made short and easy to dictate over the phone). From that moment on, the product does not check the license key at startup, but the activation data, which needs the computer to be the same in order to validate (otherwise, the DATA would be different and the digital signature would not validate). Note that the activation data checking do not require verification over the Internet: it is sufficient to verify the digital signature of the activation data with the public key already embedded in the product.
The solution is to always sign the license key response from the server using a public-key cryptosystem such as RSA or ECC (possibly better if you plan to run on embedded systems). Your application should only have the public key to verify the license key response.
Note you should always check the certificate of license key response, even if you are connected to the internet), in order to ensure that it has not been changed since it left the server (this still has to be done even if your API to the license key server uses https)
The only way to do everything you asked for is to require an internet access and verification with a server. The application needs to sign in to the server with the key, and then you need to store the session details, like the IP address. This will prevent the key from being used on several different machines. This is usually not very popular with the users of the application, and unless this is a very expensive and complicated application it's not worth it.
I've implemented internet-based one-time activation on my company's software (C# .net) that requires a license key that refers to a license stored in the server's database. The software hits the server with the key and is given license information that is then encrypted locally using an RSA key generated from some variables (a combination of CPUID and other stuff that won't change often) on the client computer and then stores it in the registry.
It requires some server-side coding, but it has worked really well for us and I was able to use the same system when we expanded to browser-based software. It also gives your sales people great info about who, where and when the software is being used. Any licensing system that is only handled locally is fully vulnerable to exploitation, especially with reflection in .NET. But, like everyone else has said, no system is wholly secure.
The validate regenerates the key and provides it with the license code, IP address (which in my case will not change and if it does then it will need to be updated anyway), and the regenerated hash then the Azure function returns if the application is licensed. I do store a "temporary" key on their server that allows the app to run for a period of time without talking back up.
I solved it by interfacing my program with a discord server, where it checks in a specific chat if the product key entered by the user exists and is still valid. In this way to receive a product key the user would be forced to hack discord and it is very difficult.
Preserves multiresolution information. Photoshop does notprovide options for opening multiresolution files; the image opensat the highest resolution within the file. However, Adobe InDesignand some image servers provide support for opening multiresolutionformats.
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