Adobe Community : Discussion List - Security & Digital Signatures

Hi,

I would like to understand a comportment of Acrobat Reader X. I didin’t find something in the “ISO-32000-1” that can explain this.

The context: I sign a document with a DocMDP signature and with an incremental update (The signature process is not realized with Acrobat Reader).

____

Acrobat Reader X invalidate the signature if the original document (before signature) contains a not used object.

Example with the file “object_5_not_used.pdf”: the object “5” is not used and not marked as free.

the object “5” is not used and not marked as free
0 5 0000000000 65535 f 0000000259 00000 n 0000000313 00000 n 0000000017 00000 n 0000000065 00000 n 6 1 0000000208 00000 n

0 5

0000000000 65535 f

0000000259 00000 n

0000000313 00000 n

0000000017 00000 n

0000000065 00000 n

6 1

0000000208 00000 n

_________

Acrobat Reader X accepts the signature if the original document contains a not used object but marked as free.

Example with the file “object_5_free.pdf”: the object “5” is not used but is marked as free.

Header 1
0 7 0000000000 65535 f 0000000259 00000 n 0000000313 00000 n 0000000017 00000 n 0000000065 00000 n 0000000000 65535 f 0000000208 00000 n

0 7

0000000000 65535 f

0000000259 00000 n

0000000313 00000 n

0000000017 00000 n

0000000065 00000 n

0000000000 65535 f

0000000208 00000 n

________

For information, Acrobat Reader XI accepts the signature of the two documents.

Is this a bug in Acrobat Reader X?

Thanks.

I need to e-sign a document and Adobe comes up with a warning on whether or not I trust the person/people that sent the document to me and after I fill out the document, I click on the e-sing link and the warning pops up. I click allow and nothing happens. What do I do?

what is the cheapest version of Adobe that will allow me to email secure pdf files?

I have a group of files I need to send via email. They have sensitive info on them. I am trying to password protect them. But, all of the results I am getting online don't seem to exist in my tool bar. i.e. "secure" and "password protect" etc. What am I missing?

I would like to limit the number of times a person can view a document and then have it inaccessible. Is there a way to do that?

Hello,

Is there any way to check if two PDF document were made by same person or by same computer?

Regards,

When I send a signature request, I never know when it will arrive. Some arrive within a moment but some arrive 15 hours or more. Sometimes, I receive an email saying that the request has been sent but, that doesn't happen either.

What is causing this erratic problem?

Is there an outage in the service at times?

When signing a document in Acrobat DC by drawing on a pen enabled machine, the signature is stored as a bitmap instead of a vector. In previous versions it was stored as a vector. How do I get Acrobat DC to use vector drawn signatures?

I've been able to add the form, using the "Prepare Form" function, adding the field, saving, and then duplicating. This does not, however meet my needs, because If one of the forms is eventually signed, or completed, the field on each other page mimics and are also signed.

My question is basically:

In Acrobat Pro DC, how can I add a space for clients to sign via their computer on each page of a 100 page document.

Thanks!

Our company wants to purchase acrobat standard/pro, but we are concerned about a user that might leave the department/company. If the user leaves the company/dept. what happens to that license? Does the company needs to cancel the license or can it be used with another user?

Is the license user specific but downloaded to the company computer? If the person does not leave the company but changes department, how is the signature treated? For compliance purposes we would not like the user to have access/ability to sign (should we choose). How is that prevented?

How do I password protect my Adobe files or folders?

Hi, Kindly suggest selecting the right product for below requirement. We are planning to give Non editable PDF to the users and they should not reuse it, so I would like to disable the below options

- Printing options

- Save as options

- Copying options

- Only the users should view the file.

Thanks

I create and sell interactive PDFs to my subscribers. I encrypt all my pdfs with passwords which only subscribers will receive once they've made payment. But recently I've discovered that some of my subscribers have been emailing the pdfs along with passwords to other non-subscribers, so they can have access to my material without payment.

Is there a way to bind a pdf to a single computer or user?

If not, are there any suggestions on how to counter this program?

when i try to sign a pdf it will not let me choose the option to "place signature"

I need to set the signature verification to Trust all root certificates in the windows certificate store. It appears that I also need to set security settings and enahanced settings for these to work.

I'm having a hard time changing the security settings on a PDF file and I want to change the settings so people can't copy or paste my work. What's the process for this because right now I haven't been able to change it.

I lost the writer's signature when I attach one document to another document, How do I restore keeping the signature. It used to work until I did something to delete the signature.

The error is "There is a system error. Please try again later." I use my Adobe ID for both Acrobat and EchoSign to log in but Acrobat will not connect to EchoSign. I would like to send documents from Acrobat without having to load them into EchoSign. I have never done this before either so it has not stopped working. Any thoughts?

Hello, I created a form for clients to fill out, save, and email back to me. I did not want to set up my email through Adobe Acrobat so I saved the file and emailed it. I emailed a test email to a friend who was able to fill everything out, but when she saved it and sent it back to me it was blank. Not sure why this is, there is no encryption or security on the pdf. I have filled these kinds of papers out before and sent them in for job applications etc. Any ideas why its returning blank?

i get an error message that some digital signatures are not validated. How do you validate a signature or can you just shut off validation.

Acrobat Reader X invalidate the signature if the original document (before signature) contains a not used object

How can I e-sign a document?

what is the cheapest version of Adobe that will allow me to email secure pdf files?

How do I password protect an existing PDF?

Can I limit the number of times someone can view a document

Forensic Document

Why do some signature requests through EchoSign arrive at random times? Some recipients receive them immediately but, some arrive 15 hours later?

Acrobat DC support for vector drawn signatures?

I need to add a signature form at the bottom of each page of a 100+ page document in Acrobat Pro DC.

Our company wants to purchase acrobat standard/pro, but we are concerned about a user that might leave the department/company. If the user leaves the company/dept. what happens to that license? Does the company needs to cancel the license or can it be use

How do I password protect my Adobe files or folders?

Hi, Kindly help me to choose the acrobat product

Binding PDF to single computer/user

when i try to sign a pdf it will not let me choose the option to "place signature"

I'm trying to use our internal CA to sign PDFs. Is there a way to set the appropriate settings using a GPO? THe 11 template doesn't have the settings that I need to enable.

How do I change my security settings so my content won't be copy/pasted?

Signature is dropped when document is attached to another document, how do I keep the signature?

Acrobat Pro XI gives an error when trying to use the Get the Others to Sign feature.

Hello, I created a form for clients to fill out, save, and email back to me. I did not want to set up my email through Adobe Acrobat so I saved the file and emailed it. I emailed a test email to a friend who was able to fill everything out, but when she s

errors with digital signatures not validated