I'm worried I haven't worded this well, but please bear with me: Background: At my place of work, we're investigating a system for loaning out digital files to library patrons. Mao - this is a legal situation, and will be regulated by agreements with the copyright holders. The files will be downloaded by the patrons to their private computers, then (for those who wish to do so) transferred over to their portable players. We're being told that it will only work with .wma files, that "Apple is so difficult", "This won't work on iPods", etc. The system we're considering using, that distributes the files to patrons, will implement a "time bomb", so that the file is only playable for the allotted loan time (1 day, 3 days, 7 days etc), and can only be played by the person who was authorised to borrow the material. The law here doesn't allow watermarks with info about individuals who borrow. Right now, this time bomb is .wma only. Question: Two of us on the project are trying to avoid a situation where we are locked to Windows, and where iPod users can't use the service. It's becoming obvious that solving this is not a priority for the vendor, so we need to investigate ourselves. We wonder how feasible it is to require that the vendor include the possibility for the patron to choose either .wma or .aac at the time of download. I understand that Apple uses Fairplay DRM in their .aac files, and that this implements the limits they choose on the music purchased via iTMS, but is it possible for us to use something like Fairplay, that will let us put our own parameters in? If so, what's out there? I obviously won't be the one doing it , I just need to know where to start looking to read up and understand.