I've seen over the months/years and specially over the latest few days, a lot of talking about the act.dat file. Yet, I have something on my mind that I still haven't found an answer yet... More specifically: I have a Vita with a JP PSN account, updated to the latest FW 3.61. Nothing new here. However, (and this is probably applied still on this latest FW version) back when it was on FW 3.60, I noticed that there is NOT any act.dat file on my system! Infact.. I play all the time online over PSN (with cartridge based game) and have downloaded quite a few game demos from the official JP PSN store (some of the demos even need a license, for example: Odin Sphere, Superbeat Xonic and DOAX3 » these 3 won't work if you try to install them using PKG Installer. They must specifically be downloaded from the store, so that the license gets generated into your PSN account data). Then again, I never bought any game in the JP PSN store, so that only leaves me to one conclusion, AFAI see it: - The act.dat file is only used to confirm that you BOUGHT those specific games. It's not used for Demos (even the ones that require a license file) nor to play online using PSN. Only this theory explains to me why my JP PSN Vita does not have the file, and yet, my EUR Vita has the file (because I bought P4G on PSN). Is this safe to assume?