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try opening the original file in LiveCycle save it as a new file, then try the "adobe acrobat pro rights save as" method on the new saved file, I've experienced this after the file has been opened in another program and it broke adobes digital signature on the file.

1. Open the form in acrobat pro2. save as Reader extended PDF3. Enable Additional Features.4. save nowThat will turn on the ability to save an in progress form with the data intact

BR001 is right, save yourself all of the headaches that will be associated with NOT having adobe acrobat pro.In addition to the rights management of the forms it also has great debugging tools and will really let you view the form as the intended audience will see it. (as opposed to the viewer in LC ES4)Acrobat PRO DC is available for US$179.88/yr and totally worth it.