Question

a company distributes proprietary software under a restrictive end - user license agreement (eula). this typically means the user is prohibited from:
installing the software package onto more than one authorized device or system platform.
using the software program to create documents that are then shared with non - license holders.
viewing or modifying the original underlying source code to customize system behavior.
connecting the software to external peripheral devices like printers or specialized monitors.

Explanation:

Proprietary software under a restrictive EULA aims to protect the software's intellectual property. Viewing or modifying the source code (which is often kept private for proprietary software) would violate the license as it could lead to unauthorized customization or reverse - engineering. Installing on more devices (if the license allows multi - device use), sharing documents (as the software's output sharing is usually not restricted in this way for the end - user), and connecting to peripherals (a common and expected use) are not typically prohibited in a restrictive EULA in the context of source - code - related restrictions.

Answer:

Viewing or modifying the original underlying source code to customize system behavior.