Price: $0
Download
allows you to:

• use GridCut for research, education, or other non-profit purposes
• do evaluation before purchasing commercial license
• adapt, arrange, or otherwise alter the source code

disallows you to:

• redistribute GridCut with your free or commercial software

Price: $3900
Purchase
allows you to:

• incorporate GridCut into your commercial software
• grant sublicenses to unlimited number of customers

Benefits:

• one-time fee
• no royalties required
• all updates/upgrades for free