Google obeys Adobe's DRM
Gmail has been since used for breaking inbuilt rights management in PDF documents for a while.
To break the protection, (Copy protection) in a PDF file, its simple to send that file by Email to a Gmail account. From there, with the "View as HTML" option, the file can be easily viewed as a hypertext and can easily be copied and its content can be extracted.
But, recently, Google had decided to follow the rules of Adobe and blocked that interesting feature from Gmail.
Now, if a protected file is "viewed as HTML", Gmail gives the message,
"The attachment cannot be viewed as HTML since the author placed restrictions on its content.Download the attachment to view in its original format.
Sounds interesting...
