Authors frequently encourage further uses of their work and may request that you provide them a copy of your finished product. If you are unable to discover the license, you must identify the copyright owners and contact them to inquire about permission to use the instrument. The following step is to determine who owns the copyright. If it is not clear, consult a lawyer. In general, if you are using an existing survey, you need to get its license from either LORC or GfK. They can be contacted via email at licensenetwork@lorc.fr or gfklegal@gfk.com. Licenses can also be obtained by calling Lorcinetwork in France at 01 44 05 85 85 or GfK in Germany at 030 64 00 030 66. If you are creating your own survey, check with the manufacturer to see if they have a policy on licensing. Some companies require that all used instruments be licensed. Others may allow unlicensed use as long as you give them credit and don't charge money for the data. Also note that some countries restrict how you can use surveys conducted for political purposes. Check with your legal counsel as to what restrictions may apply to your particular situation.