Are they really free? - Yes

Does it (download file) include source files? - Yes, download files contain jpg, gif, png, swf and .ai (adobe illustrator) formats

Are they your own work? - Yes

Can I use it for commercial purposes? - Yes

Can I sell them? - No

Can I claim that it's my own work? - No, ownership belongs to us - WNFL (Why Not Free Logos)