Ministry of Foreign Affairs of Denmark
Please note that the COP15 logo may not be used without permission, unless used in the following cases:
 

    * Media may use the logo editorially in articles/stories on COP15;
    * NGOs and country delegations who are accredited to COP15 may use the logo in material to be handed out at COP15 or in activities related to the conference. Non-accredited NGOs and other organizations may not use the logo without permission.
    * Students may use the logo in assignments and for exam projects.

The logo may not be used by accredited delegations or NGOs in partnership with other organizations without permission.
 
In the above context, the logo may only be used to inform about or show support for the conference and not as an endorsement from Denmark or the United Nations. The logo should not be part of overall branding, but only part of material or articles referring to COP15.
 
The logo can only be used commercially by partners and sponsors. All other use, i.e. non-commercial use, requires permission from the Ministry of Foreign Affairs of Denmark. 

http://en.cop15.dk/about+cop15/logo