public:99_annexes:annex-b-terms-and-definitions:b:baseline_immutability

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public:99_annexes:annex-b-terms-and-definitions:b:baseline_immutability [2026/09/12 17:42] – removed - external edit (Unknown date) 127.0.0.1public:99_annexes:annex-b-terms-and-definitions:b:baseline_immutability [2026/09/12 17:43] (current) – ↷ Links adapted because of a move operation nick_dido
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 +====== Baseline Immutability ======
  
 +[[public:99_annexes:annex-b-terms-and-definitions:start|Go to Terms and Definitions]]
 +
 +===== Discussion =====
 +
 +Baseline Immutability is the characteristic of an identified [[public:99_annexes:annex-b-terms-and-definitions:b:baseline|Baseline]] Revision whose content cannot be modified after the Revision enters the state governed by the applicable immutability rule.
 +
 +The applicable rule may establish immutability when the Baseline Revision is:
 +
 +  * Approved
 +  * Released
 +  * Published
 +  * Selected for deployment
 +  * Used to create an operational subject
 +  * Recorded as an authoritative reference
 +  * Associated with generated [[public:99_annexes:annex-b-terms-and-definitions:e:evidence|Evidence]]
 +
 +Baseline Immutability preserves the exact content associated with an identified Baseline Revision.
 +
 +A required change does not modify the immutable Baseline Revision. The change produces a new [[public:99_annexes:annex-b-terms-and-definitions:r:revision|Revision]] with its own identifier.
 +
 +Baseline Immutability differs from access control:
 +
 +  * Access control determines who may perform an operation
 +  * Baseline Immutability prohibits modification of the governed Baseline Revision regardless of ordinary modification permission
 +
 +Baseline Immutability also differs from Baseline stability:
 +
 +  * Baseline Immutability prevents modification of an identified Revision
 +  * Baseline stability concerns the frequency or significance of change across successive Revisions
 +
 +===== Definition =====
 +
 +//immutability of an identified baseline revision that prevents modification of its content after the revision enters a defined controlled state//
 +
 +===== Source =====
 +
 +Dido Solutions, Inc. and Jackrabbit Consulting, Inc.
 +
 +===== Note =====
 +
 +Baseline Immutability does not prohibit creation of a succeeding Baseline Revision.
 +
 +An immutable Baseline Revision may still be:
 +
 +  * Retrieved
 +  * Read
 +  * Compared
 +  * Selected
 +  * Reused
 +  * Superseded
 +  * Retired
 +  * Archived
 +
 +The applicable requirements determine:
 +
 +  * The state that activates immutability
 +  * The content protected by immutability
 +  * Permitted metadata changes
 +  * The mechanism used to verify immutability
 +  * The retention period
 +  * The process for creating a succeeding Revision
 +
 +===== Example =====
 +
 +After approval, a Security Baseline Revision cannot be modified. A required control change produces a new Security Baseline Revision while the approved earlier Revision remains unchanged and retrievable.
 +
 +----
 +
 +<WRAP centeralign>
 +© 2026 Dido Solutions, Inc. and Jackrabbit Consulting, Inc.
 +</WRAP>