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LibreOffice is no different than any other software when in comes down to the code.
But it is paid attention too by them. See URL below.
I would like to thank L-user from this for the following quote. Read the entire response from the URL if you have time, this is the short version.
When we are talking about security we must first provide the potential security risk? You didn't provide more details, so I will try to answer the question in general manner. 1. Protect from unauthorized access to file. Encrypt your files and share the password with your friend/coworker in secure way (like telling the password in person). You can do this by File | "Save as" and check "Save with password" checkbox. Make sure you pick complicated password with at least 14 characters. Few of them must be non-characters like numbers, special characters like: !, $, %, @ etc. This kind of password is very difficult to brake. This way you can also send file by e-mail, just don't write the password in mail. In this case I suggest to use LibreOffice 3.6 or newer, because of implemented strong encryption. 2. Someone from internet is trying to access my files? Implement firewall, antivirus. If extremely paranoid, then edit files offline and store them on USB key. 3. You would like to exchange files securely (paranoid). Use some SFTP server or FTPS or some other means like creating SSH tunnel and then transfer files inside the tunnel. (not really for non-computer-geeks) 4. You are trying to protect access to your local files by someone that has physical access to your computer? You need to install operating system by yourself (most secure) and make sure all of the operating system passwords are strong and well kept. You need to encrypt your hard disks. You need to make sure you don't install too many programs on it, because each of the program can bring some vulnerability.(this is paranoid way and not really for non-computer-geeks)
Nothing is totally secure, but that doesn't mean you shouldn't try.

Hope this helps.

On 10/13/2015 8:47 AM, Alexander Y Lee wrote:
I am Libre office user on Mac OS. Above all, I really appreciate to you guys' adventure and 
entrepreneurship to develop this kind of useful Open source software that is extremely helpful for 
Mac OS user. Documents written through MS office are always the source of problem to handle based 
on Mac OS. However, after I used your S/W, then it became much easier and I can get rid of burden 
regarding those stuff.
The reason why I write this letter is to ask you about the security of this software, I think since it is open source, so I am worrying about the security and possibility of being attacked by hacker and virus. I am very sensitive toward security and I do not want my documents sent to the hacker later. Can I make myself easy about the concern? And, does this software work independently like MS office and is it Off-line program? or Does it work through cloud service system, API, and Online based system? I wish you will not misunderstand my message, I just want to confirm the structure of the program regarding security that is my priority concern. And, separated from my question, I sincerely respect your effort. Hope to receive your reply. Thanks for your development. Best wishes, Alexander

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