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from the Books Online:
Use the WITH ENCRYPTION option:
IF EXISTS (SELECT name from sysobjects
WHERE name = 'encrypt_this' AND type = 'P')
DROP PROCEDURE encrypt_this
GO
USE pubs
GO
CREATE PROCEDURE encrypt_this
WITH ENCRYPTION
AS
SELECT *
from authors
GO
EXEC sp_helptext encrypt_this
2. ¹Ø¼ü×Ö ×Ö½Ú²»ÊÜÏÞÖÆ,±ÈSQLexplorer°²È«,²é¿´ËùÓÐSYSCOMMENTSÄÚ¼ÓÃܵĴúÂë 
create PROCEDURE sp_decrypt(@objectName varchar(50))
AS
begin
set nocount on
--CSDN£ºj9988 copyright:2004.01.05
--V3.1
--Æƽâ×Ö½Ú²»ÊÜÏÞÖÆ£¬ÊÊÓÃÓÚSQLSERVER2000´æ´¢¹ý³Ì£¬º¯Êý£¬ÊÓͼ£¬´¥·¢Æ÷
--·¢ÏÖÓÐ´í£¬ÇëE_MAIL£ºCSDNj9988@tom.com
begin tran
declare @objectname1 varchar(100),@orgvarbin varbinary(8000)
declare @sql1 nvarchar(4000),@sql2 varchar(8000),@sql3 nvarchar(4000),@sql4 nvarchar(4000)
DECLARE @OrigSpText1 nvarchar(4000), @OrigSpText2 nvarchar(4000) , @OrigSpText3 nvarchar(4000), @resultsp nvarchar(4000)
declare @i int,@status int,@type varchar(10),@parentid int
declare @colid int,@n int,@q int,@j int,@k int,@encrypted int,@number int
select @type=xtype,@parentid=parent_obj from sysobjects where id=object_id(@ObjectName)
create table #temp(number int,colid int,ctext varbinary(8000),encrypted int,status int)
insert #temp SELECT number,colid,ctext,encrypted,status from syscomments WHERE id = object_id(@objectName)
select @number=max(number) from #temp
set @k=0
while @k<=@number
begin
if exists(select 1 from syscomments where id=object_id(@objectname) and number=@k)
begin
if @type='P'
set @sql1=(case when @number>1 then 'ALTER PROCEDURE '+ @objectName +';'+rtrim(@k)+' WITH ENCRYPTION AS '
else 'ALTER PROCEDURE '+ @objectName+' WITH ENCRYPTION AS '
end)
if @type='TR'
set @sql1='ALTER TRIGGER '+@objectname+' ON '+OBJECT_NAME(@parentid)+' WITH ENCRYPTION FOR INSERT AS PRINT 1 '
if @type='FN' or @type='TF' or @type='IF'
set @sql1=(case @type when 'TF' then
'ALTER FUNCTION '+ @objectName+'(@a char(1)) returns @b table(a varchar(10)) wi