Google Drive was under attack for its mishandling of data privacy due to a security hole related to the embedded URLs. You click on the embedded link and you are taken to a third party website. This would led the unauthorized third party website owner read your header information including the document with the URL.
Google addressed the problem via its Vulnerability Reward Program. It said that the flaw was not a major one and it affected some filed in Google Drive. It added that the flaw would affect you only if there exists all the 4 below mentioned conditions i.e. if the file has been uploaded to Google Drive, have hyperlinks to HTTPS websites (third-party), its sharing settings are changed to make it available to anyone having the link or the file wasn’t in the Sheets, Slides or Docs but in its original format such as .pdf etc.
In case of all the conditions being fulfilled and the user clicking on an embedded link, the header information would be sent to the administrator of the third party website. This will help him see the URL of the source document. This flaw was compared with Dropbox hyperlink disclosure vulnerability that led to the folders with important information such as ITRs, mortgage requests/applications, banking data or any business plans.
The solution to the problem lies in following just 3 simple steps-
1) Develop a document copy via the command - File > "Make a copy..."
2) Share this document copy with specific people or via a fresh shareable link through the "Share" button
3) Delete your source document
Your safety is in your own hands, so ensure that you make adequate changes when your file is with you. Do not trust Google for this and encrypt your files. Sophos may become your ally in SafeGuard Encryption in case of Sophos Mobile Encryption and Cloud Storage. This is in case you wish to confine your business to Box.com, Dropbox etc. from directly your mobile device.