One of the users of my Free directory script, Link Bid Script asked this question just yesterday or so:
Licensing? - Link Bid Script Forum - Download Template Mods Hacks Support for LBS . The next release of the script is due out tomorrow... I just looking for the right template to include in the package to clarify the licensing issue.
The script is free to use , you can customize it to change logo and stuff but you are not allowed to remove the link back to the site at the footer , or sell the script. I wonder what licensing covers those. Freeware? Its DEFINITELY not GPL as its my property and I want it to remain so.