What if I get my sperm from a sperm bank or fertility clinic?
Your donor would have no legal rights or responsibilities as a parent. However when any resulting child born through sperm donation at a clinic reaches 18 years of age, he or she will have the legal right to gain information on their donor and indeed any other children born as a result of that donor.
There is a thorough screening and testing process by medical professionals on donor sperm which includes a six month quarantine period for the sperm before it can be released for fertility treatment.

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Legalities of co-parenting
Legalities of using a known donor
Legalities of using an anonymous donor