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Is there any way to protect offline content using DRM ? i want to sell my videos offline to my clients. How i can make sure that content once copied to my clients Desktop , i.e window it will not further copy to any another machine?.

pradeep
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The typical way to address this is not by preventing file copy, which is a hard problem. Current DRM systems all work according to the principle that the file itself can be freely copied, but it is encrypted, usually with some variation of AES-128. Then if the user has a decryption key (which is part of a "license" uniquely bound to the user's machine) he or she can play the content.

Common DRM-friendly file formats are Microsoft's PIFF (Protected Interoperable File Format), and UltraViolet CFF (Common File Format), but there are others too.

Guido Domenici
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