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Applies to: 
SQL Server
Azure SQL Database
Azure SQL Managed Instance
Drops a digital signature from a stored procedure, function, trigger, or assembly.
Transact-SQL syntax conventions
Syntax
DROP [ COUNTER ] SIGNATURE FROM module_name
BY <crypto_list> [ ,...n ]
<crypto_list> ::=
CERTIFICATE cert_name
| ASYMMETRIC KEY Asym_key_name
Arguments
module_name
Is the name of a stored procedure, function, assembly, or trigger.
CERTIFICATE cert_name
Is the name of a certificate with which the stored procedure, function, assembly, or trigger is signed.
ASYMMETRIC KEY Asym_key_name
Is the name of an asymmetric key with which the stored procedure, function, assembly, or trigger is signed.
Remarks
Information about signatures is visible in the sys.crypt_properties catalog view.
Permissions
Requires ALTER permission on the object and CONTROL permission on the certificate or asymmetric key. If an associated private key is protected by a password, the user also must have the password.
Examples
The following example removes the signature of certificate HumanResourcesDP from the stored procedure HumanResources.uspUpdateEmployeeLogin.
USE AdventureWorks2022;
DROP SIGNATURE FROM HumanResources.uspUpdateEmployeeLogin
BY CERTIFICATE HumanResourcesDP;
GO
See Also
sys.crypt_properties (Transact-SQL)
ADD SIGNATURE (Transact-SQL)