Reason stores your authorized RE licenses in a local database file called Cache.database . When you authorize an official RE, Reason writes a cryptographic signature into this cache. Team R2R reverse-engineered this signature process, allowing users to inject fake but mathematically valid license entries into the cache.
The is a specialized utility tool released by the software cracking group Team R2R to manage the database of Rack Extensions (REs) within unauthorized or emulated versions of the Reason Studios digital audio workstation. Purpose and Functionality team r2r reason rack extension cache builder