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We have several tutorials on creating custom modules on the Sitefinity Blogs
. In particular you can take a look at the Sample Generic Content based module: Products module
by Ivan Osmak. He explains how to implement permissions for custom modules in the Products module: Implementing permissions
blog post as well.
For reference you can also download the sample Products Module source code
Please, feel free to contact us if there are any more questions concerning Sitefinity.
the Telerik team