signatureSetSeedValue function does not work in Adobe Reader !

Hello eveyone,

I am looking for the solution to get the box "Lock Document After Signing" selected as default instead of manually by user.

In my sample.pdf: I use the Seed value/lockDocument like this:

         var f= this.getField('Sig1');

         f.signatureSetSeedValue({lockDocument:true})

Unfortunately the feature does not work if I open sample.pdf in Acrobat Reader and Acrobat Reader DC

So it looks like the problem with Reader and the Javascript method is that Reader forbids the use of the signatureSetSeedValue() function.

I am not an expert in Javascript and Reader as well. Does any one know the reason or any solution to get the lock enable in the Reader?

Any of your suggestion, recommendation would be appreciated !

Huong