Antivirus false positives on crack patches are to be expected.
As for the site warning—it's probably because I host some cracks and game files. Frankly, I don't care.
if you trust your antivirus, feel free to find another download link or buy this game.
You can try using KrkrExtract by creating a new empty file in the game directory and renaming it to data.xp3.
Then, drag and drop this empty file into the KrkrExtract window to extract the real data.xp3.
After clearing the game's savedata folder, I did run into the DVD verification.
I've applied a small patch to the main executable to bypass the check—give it a try. link (SiglusEngine.exe)
If you haven't applied the update patch yet, you can download DL_crack.7z to use as the crack.
Update:
crack
(read readme.txt first)
You can try applying the update patch manually.
Copy the GameData contents from the patch into the game's data folder; the patch includes the main game executable which is not protected by PlayDRM.