This is true in DE 1.0 but only partially true in 1.5. WIth 1.5 you can copy them to other computers. But the computer must be activated. BUt activation requires that we be able, for security reasons, to identify the device uniquely. Unfortunately, we cannot identify a thumb drive uniquely. SO, for the moment, at least, we cannot support thumb drives as a "library". We are working on this.