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Forum Moderators: phranque
you can find to the license descriptions at the open source initiative:
Open Source Licenses ¦ Open Source Initiative:
additional useful information at the free software foundation:
Licenses - Free Software Foundation:
assuming you are referring to the GPL, this may be the answer to your question:
For any freeware product, whether open source or not, that should be sufficient provided the credits page can be easily found. I would also suggest that you do not use nofollow when linking out.