1. A computer platform having: a trusted module which is resistant to internal tampering and which stores a third party's public key certificate; memory storing license-related code comprising at least one of a secure executor for checking whether the platform or a user thereof is licensed to use particular data and for providing an interface for using date data for monitoring its usage, and a secure loader for checking whether the platform or a user thereof is licensed to install particular data and/or for checking for data integrity before installation; and memory storing a hashed version of the license-related code signed with the third party's private key; and means for integrity checking the license-related code with reference to the signed version and the public key certificate and preventing the license-related code from being loaded if the integrity check fails.