Blogging Icons Set is licensed under a Creative Commons Attribution 3.0 License.
You are free:
to use the icons for your personal or commercial projects in any way you like
claim ownership of the icons (copyrights belong exclusively to BlogPerfume.com)
sell them to third parties
bundle them and offer them toghether with your products as a free gift
It's not compulsory but it's highly recomended that you give credits to BlogPerfume.com whenever necessary.