Who has access to the source code of proprietary software?

Access to the source code of proprietary software is typically restricted to the software's developers and authorized personnel within the organization that owns the software. This may include engineers, quality assurance teams, and other internal stakeholders. In some cases, third-party vendors or partners may also be granted limited access under strict confidentiality agreements. End users generally do not have access to the source code, as it is considered a trade secret and is protected by copyright laws.