Every nation (and in the US, every State) has differing laws governing insemination.  I cannot give legal advice (I am not a lawyer) but two states (California and Texas) have led the way in developing laws covering the topic.  Typically, other state legislators look at the lead states laws, and use those laws as models for developing similiar laws in their own states.
Both Texas and California law are mostly concerned with parental rights and responsibilities of the donor and recipient--but not so much the rights of the child conceived.  This is because the contracts to date have been written to protect the donor and recipient, and their just haven't been enough children who are suing under the law yet (for visitation, financial reward, estate heirship, etc.)
One of the big issues in Texas, for example, is that Texas law provides all children of a parent an equal share of the deceased parents estate.  So if a man has two children through marriage, and six through artificial insemination, the Texas law now says that all eight are eligible for an equal share of the estate of the deceased.  This obviously isn't the intent of the donor!
I'm attaching the latest TEXAS contract in MS Word format.  It may serve as a sample for you, but please take any legal document to your lawyer before signing it.