How does the solving applet licensing work?
The program comes with a license to use the Java applet on one web site. You can have as many crosswords as you like on that web site, and as many people as you like solving them. You can buy additional program licences if you want to make crosswords for other sites. Alternatively you can buy a multi-user license, where the number of “users” is the number of web sites on which you wish to use the applet. Read the licence.