Thanks Emilia, this is the answer I was expecting. However, this is more of a general issue, if I'm not mistaken: whether we rebuild the dlls or not, end-users of a product which is based on Telerik controls will always be able to access the dlls which are installed alongside the product and use them without permission.
Of course we are against this behavior, but there isn't much we can do to prevent it from happening, asides from following the assembly protection guidelines reported here:
I'm sorry to insist on the issue, but redistribution and licensing matters are vital for our evaluation of your product, and we must be absolutely sure about them before committing to Telerik.
Long story short, we will do whatever you state to protect your assemblies and give you copyright where it's due, but if any of our customer decides to break the law, we can't be held responsible for that and the issue shall be dealt between you and the (possible) offender.
That said, we never had such issues with our customers and we use several third party libraries in our product.
Thanks for your patience,