RSS Reader FAQ
Can I use your rsslib.php that is under MPL 1.1 when i am a "company"?
The Mozilla license allows you to use RSSLIB as a part of another script even for a commercial use.
You must just keep the mention of the licence and make the source code available, even modified.
See the license: http://www.mozilla.org/MPL/MPL-1.1.html
Is it ok to use your rsslib.php, that i have customized, as background for my gadget in facebook and other Web2.0 Social Platforms?
Same response. I would appreciate that you link on a page of your site to the original script page.