Integrated parts are often proprietary and difficult to replace.
It says that each part of the system must be easily replaceable, and that no single part can be completely reliant on any other part. An open-architecture system is one in which all the components are standard products and none of them are integrated . Proprietary Computer system manufacturers will sometimes cut corners by creating a computer component that isn't built to the industry open-architecture standard. This part is called 'proprietary' because only they have the information on how it works, and only they know how to fix it or can replace it. Whole systems have been called proprietary, simply because they follow no standard but their own.