crypting licenses

Hello

i have one question reguarding crypting.
First let me explain what i like to do:
I need to pass some licese files to customers. Everything needs to be
done "offline" which requires
me to send files to the customer that include the license
I like to encrypt the license file in one application and decrypt it
at the customer on an other application.

I did read a little on encryption and did not find any way to do the
following:
Use a private key-pair to encrypt and an public one to decrypt.

Every encryption-methods seem to be build up exactly the way arround:
use public key to encrypt and private to decrypt.
But as the private key also includes the public key, i would end up in
putting the key to encrypt the license in the customer application.
This is something i don't like of course.

Now what i need is not some way to encrypt data so it is not readable
but encrypt it in a way that it is not reproduceable.

Is this something thats achiveable with signed data (signed xml eg.)?

many thanks in advance

_rene
.

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