Closed platform - Wikipedia

A closed platform, walled garden, or closed ecosystem[1][2] is a software system wherein the carrier or service provider has control over applications, content, and/or media, and restricts convenient access to non-approved applicants or content. This is in contrast to an open platform, wherein consumers generally have unrestricted access to applications and content. For example, in telecommunicati

[shiumachi]

i-mode や iPhone など、メディア系の事業における囲い込みのことらしい。