waste_me (the other guy behind unSafeShit 2512x) told me that SD version 2.60.52 is a completely new version ("almost everything is different" he said). it installs some vxd (SecDrv02.vxd i thought) encrypting/decrypting some critical pieces of code: inside the SD code itself, but also in the main exe. and that vxd seems to be a very nasty thing.
also the rebuilder will have to be recoded, since SD 2.60 uses new algos.
everything can be cracked, but i'm afraid it will take a while before a public unwrapper for SD 2.60 will be available