How do I view the definition for a stored procedure that cannot be modified in SQL Server 2008 R2?

Question

I am trying to view a stored procedure that resides in a database running in SQL Server 2008 R2. I have found the stored procedure under [dbName] > Programmability > Stored Procedures > dbo.[sprocName] but it has a little padlock icon next to it and when I right click on it to modify it, the modify option is grayed out.

I then tried to access the definition by querying object in the database like this:

use [dbName];
select * from sys.sql_modules
where definition LIKE '%[sprocName]%'

This does not yield the definition for the desired stored procedure, but the query does work for stored procedures that I can already modify.

How do I view the definition of this stored procedure without gaining modify privileges?

Update

It appears that the Sproc is in fact encrypted based on this error message:

TITLE: Microsoft SQL Server Management Studio
------------------------------

Script failed for StoredProcedure 'dbo.[sprocName]'.  (Microsoft.SqlServer.Smo)

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ADDITIONAL INFORMATION:

Property TextHeader is not available for StoredProcedure '[dbo].[sprocName]'. This property may not exist for this object, or may not be retrievable due to insufficient access rights.  
    The text is encrypted. (Microsoft.SqlServer.Smo)

Answer 1

In order to do this you will need to have all the necessary permissions (SA basically) but here is a site that you should be able to follow to fix the problem.

http://sqljunkieshare.com/2012/03/07/decrypting-encrypted-stored-procedures-views-functions-in-sql-server-20052008-r2/