Photographers can't buy photos without permission.

Yes, that's right. Because photographers generally work for photo studios or photo studios and sign fixed labor contracts.

After the photographer takes pictures of the customer, the photos and negatives belong to the customer according to law. If the customer doesn't ask for it, the ownership also belongs to the company.

Photographers are not allowed to sell photos without permission from the company.

The second possibility is that photography is to find a photographer to sell his photo ownership privately and then publish it as his own work in newspapers and magazines.

If the photographer who sells photos is the same person and has a formal contract, then the photographer can buy photos.