# Rules for freezing and locking

When you freeze or lock a form or case report book, the following rules are in place:

Rules for freezing and locking

Activity allowed? | Frozen CRF | Frozen case report book | Locked CRF | Locked case report book
--- | --- | --- | --- | ---
Add/update subject data | No unless allowed.* | No unless allowed.* | No | No
Add/update comments | No unless allowed.* | No unless allowed.* | No | No
Open queries | No unless allowed.* | No unless allowed.* | No | No
Answer queries | Yes, but can change data value only if allowed.* | Yes, but can change data value only if allowed.* | No | No
Close queries | No unless allowed.* | No unless allowed.* | No | No
Mark SV ready | Yes | Yes | No | No
Source verify | No unless allowed.* | No unless allowed.* | No | No
Sign CRF | Yes | Yes | Yes | Yes
Sign case report book | Yes | Yes | Yes | Yes

* Sponsor users can perform this activity only if the study has been configured to allow sponsor users to update forms after they are frozen.

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