Wikipedia
Registrar-Lock
REGISTRAR-LOCK is a status code that can be set on an Internet domain name by the sponsoring registrar of the domain name. This is usually done in order to prevent unauthorized, unwanted or accidental changes to the domain name.
When set, the following actions are prohibited by the domain name registry:
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Modification of the domain name, including:
- Transferring of the domain name
- Deletion of the domain name
- Modification of the domain contact details
Renewal of the domain name is, however, still possible when REGISTRAR-LOCK is set.
Not all Top-level domains (TLDs) support REGISTRAR-LOCK, e.g. .org.uk, and others.
The .ca TLD added support for REGISTRAR-LOCK in October 2010.
RFC 2832, section 6, and RFC 3632, section 2.1, lists the different status codes and their descriptions.