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addresses for different users If user John Savill, who had e-mail address john@savilltechcom leaves the company, and John Smith joins and is given John s old e-mail address, Smith might be able to get access to RMSprotected information to which only John Savill should have access One option to stop e-mail addresses from being reused is to disable users who have left, but not to delete them The rst time a user wants to protect a document with RMS, he communicates with the RMS server, which is found by the client in the enterprise by querying for the Service Connection Point (SCP) created during the AD RMS role installation An alternative is manually specifying the AD RMS server at the client After contacting the AD RMS server, the user receives two pieces of information The rst is a Rights Account Certi cate (RAC), which is a public/private key pair for the user s account encrypted with the client machine s public key Each machine with the RMS client has a key pair with the RMS server as well The key pair is based on the hardware ID of the client that is hidden away in the %alluserspro le%\Application Data\Microsoft\DRM location The second piece of information is a Client Licensor Certi cate (CLC), which is a copy of the RMS server s public key It allows content to be protected of ine The CLC enables the client machine to de ne usage rights and rules for the les These certi cates, which are in eXtensible Rights Markup Language (XrML) format, are stored in the %USERPROFILE%\AppData\Local\Microsoft\DRM location in Vista or %USERPROFILE%\Local Settings\Application Data\Microsoft\DRM\ in older operating systems These keys are strongly protected and form the RMS lock box, which is the protected store for RMS and is part of the RMS client The last stage is that the application used to author the data creates a publishing license (PL), which attaches to the document and then encrypts the content of the le The operating system handles all this automatically When a recipient receives the RMS-protected le and opens the document, the RMS client on the receiver s machine opens the PL in the document and contacts the RMS server identi ed in the PL The recipient sends the RMS server the PL from the document and the user s RAC If the user does not have a RAC, the user is enrolled with RMS so that the user has a RAC before access to the document is initiated Based on the PL and the user s RAC, the RMS server issues the user a use license (UL) that consists of a content key so that the client can access the content It is encrypted with the user s public key and signed by the server If the user does not have rights, the document is not decrypted, which is the strongest
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piece of protection in RMS If the user has rights to the le, the application then processes the UL, renders the le, and enforces the rights detailed in the PL that travels with the encrypted le For example, the PL might state that the document contents cannot be cut and pasted Obviously there are ways around this, but they are not easy You could retype the content of a document or use a camera to take a picture of the screen The normal Windows Print Screen, however, does not function while a rights-protected document is open However, third-party screen capture utilities might still work If the receiving user does not have the RMS client, she receives noti cation that the document is protected with RMS and is directed to download and install the RMS client If you use RMS in your organization, ensure that you use Windows Vista or have the RMS client deployed There are numerous ways to deploy the RMS client to pre-Vista clients You can deploy with Group Policy, make the client available on a le share, or even package with Of ce so that any machine that gets Of ce installed automatically gets the RMS client Mobile devices are a special consideration because to read protected content, they need to contact the RMS server, which they might be unable to do There are some workarounds If the protected document is read on a PC and then synchronized to the mobile device, the document already has the RMS license in the document, so the mobile device can read it Another option is to use Exchange 2007 SP1 s capability to prelicense an RMS e-mail Exchange 2007 SP1 can contact RMS as it sees protected content going to a user s mailbox and contact RMS on behalf of the user and get the required RMS license This avoids users having to communicate with RMS as they try to read protected content This is useful for mobile clients that might not be easily connected to RMS because Exchange is prelicensing; then no call is needed to RMS because the license is already put into the data This is also useful if you send out a protected e-mail to 50,000 employees Normally every user would try to contact RMS at the same time With Exchange 2007 prelicensing, this is done in batches by Exchange (resulting in fewer calls to RMS), and the users aren t required to directly contact RMS Applications that support RMS include Of ce 2003/2007 applications with support for the main Word, PowerPoint, Excel and InfoPath (2007 of ce only) formats Additionally the XML Paper Speci cation (XPS) format is RMS-aware as part of Windows Presentation Foundation RMS support SharePoint is also RMS-aware, allowing you to con gure RMS for
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