When creating asymetric key from assembly does assembly need to stay on the file system

Question

I am deploying a SQL Server CLR project to my database and am usure of something. To give the function in the project external access I am creating an asymetric key from the projects assembly, creating a login from that key and granting access to that login. From MSDN:

USE master 
GO  

CREATE ASYMMETRIC KEY SQLCLRTestKey FROM EXECUTABLE FILE = 'path\to\my\assembly.dll'   
CREATE LOGIN SQLCLRTestLogin FROM ASYMMETRIC KEY SQLCLRTestKey   
GRANT EXTERNAL ACCESS ASSEMBLY TO SQLCLRTestLogin 
GO 

My question is, do I need to keep the assembly on the file system after the key is created for the login to work? I know I could test this by doing the above then removing the assembly and seeing if things break but the only environment I have this type of access to right now is a production one and I don't want to muck around with things there. Thus, I asked here. Could anyone tell me if I need to keep the assembly after the key is created? Thanks!