Dear everybody, very very sorry for too late reply. I am not using osc forums much.
Yes I admit this is not my work. But really I never thought of taking the credit, I download those files from some other site, not as the author site and I didn't think much it is important to read the license, because in my country software piracy is very common and no body cares about that and in most of progressive countries it is like that.
I forgot to tell you guys that if you are living in such a country where copyright is considered important, don't use these icons.
Also some moderator find those icons are not mine, so he asked me in pm and I told him, I recreated them, not created them from scratch. So moderator has removed that.
Still if you are interested in these icons, you may download them from my blog. But if you feel copyright is important then don't use them. See I am using them at my site from 1 year and author never knows that and even he knows he couldn't do anything, because copyright law doesn't work across countries