Apple says it has dealt with the rogue server that was causing apps to crash these days
We had a temporary issue that began yesterday with a server that generated DRM code for some apps being downloaded. The issue has been rectified and we don’t expect it to occur again."He went on to see that this unusual app crashing bug was coming from Apple's server side, and Cupertino indeed issued a statement last night that the rogue server has been identified and the issues fixed: "
It seems that the software that is responsible for unshackling your purchased app, was not doing what it's supposed to do, and the apps got blocked because of DRM protection, causing them to not start at all or crash immediately after launch.