A couple of days ago someone had asked me about Renditions in Documentum, Let me try to explain very briefly what renditions are.
Renditions are Representations of a Document in a different format. In other ways, the only difference between a document and its rendition is only its format. When you create a document in Documentum you specify the file format for that object, this file format is the Original format of that object. The renditions of this object have the same properties of the original format object but it’s in a different format. These renditions are made either using Documentum Media Transformation Service or the supported Converters.
The Converters are basically for Transform one type of graphic image to another type (e.g.: TIFF to JPG) or one-word processing format to another word processing format (e.g.: PDF to MSWord). There are few converters that come with the Content server, you can either buy or make your own custom converters. I am not getting into details of Converters here.
When you request for a rendition that uses converters Content Server creates and manages the Renditions automatically. You can also add renditions manually.
If you wanted to add renditions manually you can create the rendition by your own means and use addRendition() IDfSysObject interface.
For removing a rendition use removeRenditon() of the same IdfSysObject interface. You have to have at least write permission to remove rendition of a Document.