I am not a lawyer, but I can provide some general information on this topic. The specific laws regarding selling a product with a service attached may vary depending on your jurisdiction. However, there are a few key legal principles that could potentially apply to your situation.

1. Contractual obligations: When you sell a product with a service attached, you typically enter into a contract with your customers. The terms and conditions of this contract should outline the rights and obligations of both parties. It is important to clearly state what services are being provided, for how long, and any limitations or conditions that may apply. If your business shuts down, the contractual terms would determine whether you are still obligated to provide the service or maintain the QR codes.

2. Warranty and guarantees: Depending on your jurisdiction, there may be consumer protection laws that require you to provide certain warranties or guarantees for the products you sell. These laws may specify the duration of the warranty or guarantee period and the remedies available to customers if the product or service fails to meet these standards. It is important to familiarize yourself with these laws to ensure compliance.

3. Intellectual property rights: If the QR codes are protected by intellectual property rights, such as patents or trademarks, the ownership and licensing of these rights should be clearly addressed in your contracts. If your business shuts down, the rights to the QR codes may be transferred or licensed to another party, or they may become obsolete. Consulting with an intellectual property lawyer can help you understand and protect your rights in this regard.

4. Consumer protection laws: In some jurisdictions, there may be specific laws that protect consumers in the event of a business closure or bankruptcy. These laws may require you to provide refunds, alternative solutions, or other forms of compensation to customers if your business ceases to operate. Again, consulting with a lawyer who specializes in consumer protection laws in your jurisdiction would be advisable.

It is important to note that laws can vary significantly depending on your jurisdiction, so it is crucial to consult with a lawyer who can provide specific advice tailored to your situation. They can help you draft appropriate contracts, understand your legal obligations, and mitigate any potential risks associated with selling a product with a service attached.