Adobe (Acrobat) Reader 6.0 and later versions support the ability to add comments, enter bids, and save PDF files with special permissions.

This special permission is "Enable For Commenting and analysis In Adobe Reader", which makes sense For people who have little access to PDF or PDF and do not need too many complex processing tasks, you do not need to purchase a Acrobat of thousands of RMB to fill out a bidding order or add a comment (using piracy is another matter). You can download an Adobe Reader 6.0 or a later version on the Internet.

How can I allow a common PDF file to be freely added, filled in, and saved in Adobe Reader 6.0 or later? Currently, the following solutions are available:

• Use the "Enable For Commenting and analysis In Adobe Reader" function of Acrobat 7.0 professional to process normal PDF files with this special permission;
• LiveCycle Reader Extensions is more expensive and is unnecessary for general users;
• Other third-party solutions;

In fact, this requires the PDF provider (which is currently widely used by the embassy in China) to convert the PDF file into a format that is convenient for the applicant to use.
The following describes how to use this convenience in Adobe Reader:

 

 

 

 
Set Thickness (Border Thickness) to 0 and Fill Color to colorless.

Repeat the preceding steps.
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P.S.
Associated Materials:
Adobe's "Enable For Commenting and analysis In Adobe Reader" function of Acrobat 7.0 professional does not support batch processing of PDF files because a save dialog box is displayed, therefore, if a company has a large number of PDF documents that need to be converted before, it is indeed a difficult problem. Now, I have developed a program that uses acrobat to process PDF files in batches, if you are interested, you can see:
Batch ReaderEnable: programmed to implement Batch "Enable For Commenting and analysis In Adobe Reader"