> 2 - Restrict a program to run at a certain site by requiring a licence > file. The file can include for instance some site details encrypted > (Have heard of using the hard disk name hashed). The licence file > checking code has some behind the scenes check to make sure its at the > right site or computer. Same for locking it to a particular computer - make a hash from a variety of computer components and use that to create a licence key. Before writing code to use it though, find (on a virtual machine that you trash immediately afterwards) blackhat tutorials on using things like Softice to crack programs. Its pretty impossible to stop a really determined attack but you look at basic attack strategies, you can code to make those approaches a great deal more time consuming. If there is commonly used commercial software for program protection, then you can bet there will be tutorials on cracking it too. Avoid anything used by computer games.
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