It's not a good practice to hide content on a document where users apply digital signature , One would not want to sign on a document which has some hidden content.If you do not want users to fill some fields in that subform then you could add validation checks in the preSign event of each signature...

Is there any sequence in which signature fields need to be signed? or could they be signed in any order?

not sure what exactly are you trying to achieve here.The only changes that are allowed after signing a PDF are filling form fields , adding annotations & signing any unsigned fieldsCan you elaborate on the complete usecase? Have you tried using field locking ?

Sandeep,Is your intention to remove the password encryption or just extract data from it?If you want to remove password encryption then you should first remove the usage rights and then remove pass encryptionIf you want to just extract data from it - You can create a short lived subprocess that has ...

You can go through http://help.adobe.com/en_US/livecycle/9.0/programLC/javadoc/index.html?overview-summary.html if you want to achieve it using LiveCycle java APIsgetDocumentUsageRightspublic GetUsageRightsResult getDocumentUsageRights(Document inDocument) throws com.adobe.idp.dsc.DSCException, Read...

What is the number of target audience whom you would send those files?If the number of people whom you share the document with is less than 500 and if you have very less number of such forms then you can actually use this functionality in Adobe Acrobat.If you are trying to do this on a large scale f...

What's your usecase? and are there any problems using Reader Extensions?

In case if you had to achieve this for Reader 8.x versions1. You can lock the signature field on initialization or documentReady2. Add a button for validation check3. Do validation when the user clicks the button added in step # 24. If all validations are succesful then unlock the signature field--S...

LiveCycle Designer and LiveCycle Workbench installer are available along with LiveCycle. You might have already received them along with LiveCycle ES2.Adobe LiveCycle Enterprise Support can be contacted to provide you ES2 Designer installer if it is not available online.--Santoshhttp://about.me/nsku...

Acrobat 8.x & Adobe Reader 8.x is already EOLed https://www.adobe.com/support/products/enterprise/eol/eol_matrix.html#86Adobe Reader8.xWindows and Macintosh11/3/200611/3/2011It's better to recommend your users to upgrade to latest versions. Is it an enterprise wide installation?--Santoshhttp://about...