I am a private entrepreneur from Russia, engaged in the development and use of sites in Drupal. For my work I have produced a logo and print to stamp, which is partly used image Druplicon.
I read that I need to obtain permission from the owner of the rights to use the image of Druplicon, in some cases.
Could you help me to determine the necessity of getting permission for this logo usage?
My logo = http://dl.dropbox.com/u/1032791/drupalkot_mini.png
My stamp = http://dl.dropbox.com/u/1032791/drupalkot-tatu5.png