Are these logos really free?
All logos published on Logolix can be used for free. You can use them for commercial and noncommercial projects. No need to ask for permission, or provide credit to Logolix. (It would be a generous gesture if you did.)
Can I "resell" these designs?
The license does not include the right to gather logos from Logolix and use them for a competing service/product. Implementing these logos in "free logo builders" is strictly forbidden.
Can I trademark one of these logos?
Downloaded logos are nonexclusive and can not be claimed or trademarked. The same marks can be used by different companies at the same time.