I was able to add the dbcreator server role to a user of a SQL Server DB, thanks to this nice question/answer: create-database-permission

How can I REMOVE that permission? Is there a stored procedure like sp_addsrvrolemember that works on the contrary and that I can use to drop that permission for the same user for which I granted it?

I need to do it programmatically.

Many thanks in advance!

(Sorry if a similar question was already asked, but I was not able to find it)