How can I let users enter the cck value once and then protect the field from editing? I have several cck fields that shouldn't be modified once after the node is created. For example like fields for gender, name, birth date and so on.
Is it possible to hide or make them unable to edit those fields by users after the node creation?   I thought maybe I could do that by Rules but unfortunately it seems that there is no action for hiding cck field forms though it has the condition for "if field has a value".
I think the link below will be helpful to you..

Code snippet: How to set the disabled or readonly attribute of a CCK field

Check this link and let me know if in case of any query.

Thanks.