The first is to use the relevant patents exclusively for scientific research and experiments.
Second, the use or sale for production and business purposes without the permission of the patentee is unknown.
Patented products manufactured and sold or products obtained through proper channels can be proved.
If the legal source of its products is clearly stated, it will not be responsible.
After the enterprise goes bankrupt, the copyright still belongs to the original enterprise. According to the law, goods may not be traded in the name of the original company.
If you want to operate, I am afraid it is best not to have the original company name on it. Although it closed down, it existed for a certain time.
If your company is legally cancelled in the Administration for Industry and Commerce, it means that the company's legal personality is gone. If the copyright owner of the software is your original company, and this company has not transferred the copyright to others, then there is no "person" to safeguard the rights and interests at this time. You can use it safely.
Of course, it depends on the agreement between you and the company on the property rights of the software you are involved in developing. If there is no agreement, you can use it with confidence.