Prechecks, postchecks.. Thus your unencrypted file contains a little bit check stuff, then the TRIAL days left, that's '1Eh' (=30days) then the Trial key. That's all. Some people revoke ownership from everything for the file, so the program doesn't descend trials anymore. The encryption method on 'zllictbl.dat' is called BlowFish. It was an algorithm invented by Bruce Schneier, and it's symmetric. All you need is the encryption/decryption secret which is 10h bytes long You can decrypt back and forth. Tools used on VSDATA.DLL: Ida Pro/PEiD Kanal Plugin/IDA code ripper & MASM32 grtz x7a - apologies but I'm having a hard time removing the attachment.