The Royalty Free version is open source, however it appears to be a highly restricted version of the GPL v1 license, where any application that uses lingpipe, by API calls or even by separately using the output of lingpipe, must comply with an Open Source Initiative license.
Somewhat interesting clause that may restrict "freedom", but none-the-less still enables it to be open-source.
Somewhat interesting clause that may restrict "freedom", but none-the-less still enables it to be open-source.
http://alias-i.com/lingpipe/licenses/lingpipe-license-1.txt