You'll want to implement an admin or policy capability pattern. Create a unique capability object within the package that should have exclusive update rights. Then, have all the update functions for the shared object require a reference to this capability object as an argument. This way, only the owner of that specific capability can call those update functions, effectively restricting edits to your package.

To ensure that only a specific package can update a shared object, you can use patterns like sender or capability gating. One way is to implement a capability pattern, where you allow updates based on ownership of an object. Alternatively, you can create an Access Control List (ACL) to allow only certain addresses to interact with your package's methods. These methods are detailed in resources like the capability pattern documentation and the denylist rule, which can be seen here and here.

To make sure only a specific package can update a shared object in Sui Move, you need to build in access control directly into your smart contract logic. One way to do this is by using a capability pattern, where you create a special object that acts like a permission slip—only the package that holds this object can make changes. You can also check the sender’s address during a transaction and allow updates only if it matches the expected package address. Another option is to include an access control list inside the shared object itself, listing which addresses are allowed to make edits. These methods help you lock down the object so that other modules or packages can’t tamper with it.