Digital cameras utilize either proprietary or standard consumer batteries. Implementation focuses on PeopleSoft's proprietary PeopleTools technology. Skype's client uses an undocumented and proprietary protocol. Sometimes, FOSS is not compatible with proprietary hardware or specific software. A large number of proprietary and open source applications exist to process remote sensing data. These companies each defined their own variants of emoji using proprietary standards. The product is a proprietary implementation of HFS+ based on Paragon's proprietary UFSD library. Users often may not reverse engineer, modify, or redistribute proprietary software. These are laid down using specialized and proprietary equipment. Wwise is intended to be compatible with proprietary and commercial engines. These attacks relate to stealing data of corporations related to proprietary methods or emerging products/services. Stallman has participated in protests about software patents, digital rights management, and proprietary software. Alphabet Inc. sued Uber over technology similar to Alphabet's proprietary self-driving car technology. Many serverless function environments are based on proprietary public cloud environments. International tended to use proprietary diesel engines.