Hi Alex et al, Of course DPM is open source and welcome contributions. I believe that there is (essentially) no UK experience with DPM. Am I correct in this understanding? Although the sites that are in SC3 must use dCache would it be worth encouraging other sites to gain experience with DPM? I pose this as a question and would be interested in other people's opinion. I do have a problem with dCache not being open source. I know John will say something like I use commercial products without ever having access to the source code but DESY is no microsoft. All the best, david