Mark as read-only without digital signature

hello,

 

i know can mark fields in form read-only digital signature properties. 

 

now have form must mark fields read-only, don't want use digital signature that.

is possible mark fields in form read-only without using digital signature. maybe button?

 

kind regards,

 

jarno

tools > prepare form

 

in properties of fields can check "read only".

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