Thank you for your question. I look forward to working with you to provide you the information you are seeking for educational purposes only.
If you are selling the software to an entity covered by privacy laws, then you must protect your access in accordance with the privacy laws, this is no different than a non-healthcare business doing work for a covered healthcare provider/insurer, they must comply with the rules governing the covered entity as an agent to the covered entity. Thus, you need to protect the data access under the FERPA privacy rules, but as you nor the school are healthcare providers or healthcare insurers HIPAA does not make the school a covered entity so it would not be under HIPAA rules. Here is an article on FERPA computer security
for information purposes.
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Also remember, sometimes the law does not support what we want it to support, but that is not the fault of the person answering the question, so please be courteous.
This is NOT the practice of law nor is it legal advice to you, it is merely educational information for you to use to seek out a licensed attorney in your state to get actual legal advice from them. Please use sites such as http://www.martindale.com or http://www.lexmundi.com or http://www.hg.org to find a local attorney to get actual legal advice in all matters.