Creating a single public key and multiple private keys

Hello,
I am new to java cryptography. The problem statement is :-
We have an accounting application, with flexibility of number of users and companies. The number of users and companies for this application has to be restricted based on the license the user has. That is the user will download our application via web while the user downloads he has to be given the key according to the license he has requested (i.e. single or multiple users/companies), I am unable to get the logic of private and public keys as such, y because which ever alogorithm i saw will generate a public and private key in pairs hence i am bit confused. Clearly, For ever additional user (or company) we r charging additional amount hence different license (keys) have to be generated dynamically for different users. I think this can be achived by creating one single public key and multiple private keys, but i am not sure . Please help me out.

Hi kazim
would u pls elaborate this , since i am working on same kind of scenario and finding solutions is difficult . Since encryption is done at our end and wen some user downloads an application he is unable to track where it was encrypted . What i have undestand about public /private is that they work in agreement between client and server and both has to come to agreement to share the data. Pls correct me if i am wrong.
Ours is different senario we will send some key in download application and will want him to decrypt it . What would u suggest for this kind of scenario?
Thanks in advance
Janesh

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