On installing MusiCAD on Windows-Vista or Windows 7, you will almost immediately get a notification from Windows that it "cannot verify" its publisher.MusiCAD could not be verified!
Of course Windows is right...
Currently we do not have any certificates to give Windows a way of verification. Nor do we have a site certificate. We are trying to keep prices as low as possible; expensive, yearly to be renewed, certifications from Microsoft or Verisign do not fit into that picture.
Since our site does not allow immediate sales, site verification is no big deal. As long as you download MusiCAD from one of our sites
musicad.org, musicad.nl, musicad.com or musicad.eu you can be quite sure that it is the original software. Furthermore, MusiCAD is equipped with a built in check whether the program is unmodified, so hackers will have a hard time getting their 'job' done.
Last but not least, keep in mind that in the end any software/site will remain vulnerable to attacks, so certificates might give a wrong sense of security...
see also http://nl.musicad.org/forum/viewtopic.php?f=7&t=82 (in Dutch)