Licenses for performance software is tail number specific. Every product comes with a One-user, One Device license.  To place the purchased product on a second device of similiar type (PC is one type, PDA is a different type) a Two Device License is required. This license can be used for a second individual also.  The Flight Department License (FDL) allows the purchased product to be placed on as many devices desired (of the type supported by the product purchased), as long as the product remains under the control and ownership of the flight department. A separate FDL must be acquired for each aircraft (tail number specific).  If both PDA and PC-based products are purchased, the flight department license shall cover both types of devices.