The trial version of FastChords has almost all features enabled (see below) and works for a full 15 days from the date of installation.  Further, a full refund policy is in effect during seven days following the purchase of the software.

That is pretty good.

The differences between the trial and the full version are:

1) check for updates is disabled in the trial version.

2) printing is enabled only for the 4 songs installed with the program.

Updating to newer versions of the chords dictionary and manual is only possible from within FastChords itself.

A temporary registration key is issued when you first license the software.   A permanent registration key is sent automatically after the 7 days refund policy expires.