1. A method of allowing inclusion of a structural component which is the confidential property of an owner in a third party remote product simulation, the method comprising, in owner modelling software: importing a component model including geometry of the component, mesh data and at least one material property of the component; encrypting a secure part of the component model which is to remain confidential to the owner using a software key, and leaving an interface part of the component model unencrypted; adding a restriction to the component model before the component model is exported, the restriction specifying simulation result data which is not to be visible to the third party; and exporting the partially encrypted component model to the third party for use in third party modeling software.